Pierce (heel), Rondo (ankle) miss practice

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Pierce (heel), Rondo (ankle) miss practice

WALTHAM The Boston Celtics have only had three days of practice, and players are already starting to miss action.

Rajon Rondo suffered a right ankle sprain about halfway through Sunday's practice, and did not return. Fellow starter Paul Pierce suffered a right heel injury that kept him off the practice floor for the second straight day.

While both injuries are considered minor, the C's were once again unable to have enough bodies in practice to even do any 5-on-5 work.

This has left head coach Doc Rivers little choice but to do a lot more 3-on-3, and 1-on-1 work with players in addition to pick-and-roll defense using four players.

"You can still have a practice," Rivers said. "The problem is, we haven't had a scrimmage yet at all. It's three days in a row now we haven't been able to go up and down with five-on-five, with your players. That's three days in camp that we've missed already."

It has created a considerable amount of day-to-day uncertainty, which is why the C's have scheduled Monday's practice later in the afternoon in hopes that the yet-to-be-cleared paperwork will be done in time for those unable to practice to be on the floor.

"Right now, as far as I'm concerned, we haven't started camp yet," Rivers said.

OFFSEASON

Who will make the Celtics roster?

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Who will make the Celtics roster?

BOSTON – Regardless of what the Celtics do in the offseason, there will always be position battles in training camp.

But when the players arrive in a few weeks, a handful will have more at stake than just a roster spot.

Boston currently has 18 players with full or partially guaranteed contracts, a number that has to be pared down to 15 or less by the time the regular season begins.

The math is pretty cut and dry. Barring a trade, at least three players have to be let go.

But who will they be?

That’s for Brad Stevens and the rest of the Celtics brass to figure out.

In the meantime, here’s a look at five Celtics who, barring a trade, are likely to be among the pool of players Boston will be picking from for what should be the last couple of roster spots.

Brady spikes his helmet in frustration during competitive day of practice

Brady spikes his helmet in frustration during competitive day of practice

FOXBORO -- It could have been that he's been splitting first-team reps with Jimmy Garoppolo. It could have been that he had just thrown a pass that was batted down by a ball boy holding a paddle. It could have been that he's simply operating at a low boil at all times knowing that he has to serve a four-game suspension. 

Whatever the reason, Tom Brady was hot. And he took it out on his helmet Friday, slamming it to the turf -- with ear pads exploding out upon impact -- after the final snap of the 7-on-7 period at Patriots practice. 

It was the most noteworthy show of frustration during what appeared to be a highly-competitive day of work for Bill Belichick's club. Just two days into practice, and one day before the first day of work in full pads, there was a visible emotional edge exhibited by several players on the team -- not only Brady. 

"That's just football," tight end Martellus Bennett said. "It is what it is. I like guys that have an edge, and I think a lot of guys on this team have an edge. When they have that edge, it makes you bring it up a notch, too."

Bennett may have helped to amp things up when he caught a touchdown pass over Patrick Chung from Jimmy Garoppolo. He used his 6-foot-7 frame to go up and over Chung and then kept his balance as he corralled the ball with Chung down around his feet. When the play was over Bennett almost dropped the ball on Chung while Chung was on the ground. 

Later in the practice, Rob Gronkowski caught a touchdown on a back-shoulder throw from Garoppolo with Jordan Richards in coverage. Gronkowski promptly threw the ball in the air in celebration, which seemed to irk Dont'a Hightower. The linebacker quickly retrieved the ball and chucked it at Gronkowski's back. 

Brady's helmet slam came on a short pass that was batted down by one of the paddles made to simulate long-armed defensive linemen. He hadn't looked very shaky leading up to that point, completing 7-of-9 passes, though one of those attempts resulted in a Duron Harmon interception. But two incompletions to finish his 7-on-7 stretch led to the helmet slam that drew an audible reaction from surprised fans in attendance. 

Brady's reps and their timing drew considerable attention yet again. In a switch from Thursday's practice, it was Brady who took the first-team reps during 11-on-11 work, while Garoppolo was the first on the field during the 7-on-7 portion of practice. Each player got 10 snaps in 7-on-7 work and seven snaps in 11-on-11 work, so the workload was once again split evenly. 

In analyzing the results for both quarterbacks, Garoppolo went 9-for-10 in 7-on-7 work, while Brady went 7-for-10 with an interception during the same period. In the 11-on-11 portion of practice -- after the helmet spike -- Brady went 5-for-7. Garoppolo went 4-for-7, and Jacoby Brissett went 4-for-7 with an interception made by linebacker Kevin Snyder on a deflection from corner Darryl Roberts. 

It's not unusual for competitive moments -- and accompanying emotional outbursts -- to transpire during camp. That it's happening already with the Patriots could foreshadow weeks of such moments, which, given the talent level the team currently boasts on its roster, perhaps should be expected. 

When both sides of the football have as many accomplished players as the Patriots do, and when both sides are executing, the level of play tends to rise. With that, the competitive juices often do the same. 

"Every single day I've been here since OTAs it's been very competitive," Bennett said. "Everyone here does their jobs so well, and everyone's competing. You just gotta bring it every single day."

That may not be good news for the equipment staff that has to deal with the fallout of busted gear. But for coach Belichick, who has long called training camp the "competition camp" (as opposed to OTAs and minicamp, which is more of a "teaching camp"), it's probably music to his ears. 

Bennett, Gronkowski are students of each other's games

Bennett, Gronkowski are students of each other's games

FOXBORO – It’s nothing but bliss so far for Martellus Bennett in New England.

The humongous and irrepressible Marty B. met with the media after practice Friday. Fresh off a workout in which he picked a red-zone pass off the top of Patrick Chung’s helmet and did a little, “Lemme just leave this right here . . . ” placement of the football at Chung’s feet, and otherwise continued to stand out in all the right ways, Bennett spoke about his developing relationships with Tom Brady and Rob Gronkowski.

Bennett, Gronk and Brady have been working as a unit during a few quick side sessions. It’s an annual occurrence with Brady and his leading targets. Bennett shared an interesting detail though that refers back to something Brady spoke of with Gronk in 2015:

Body language.

“I think for Rob it’s a little different than for me (working with Brady),” Bennett explained. “He’s been with Brady so long and he knows the body language. And we move differently. Even though people think we’re a lot alike, we run our routes different. Understanding the body language of how I go into my cuts and where I like the ball might be different than when he throws to Rob, so we’re just trying to build as much chemistry as possible. It’s just conversations in motion.”

Brady mentioned last year how he’s able to watch Gronk running with his back to him and still read subtle cues as to when Gronk is going to cut, slow down, accelerate, etc., and then time his throw accordingly. Brady is in the early stages of learning Bennett’s subtleties.

And Bennett is learning from watching the other two. Dripping sweat after the workout in humid, cloudy conditions, Bennett got animated talking about the process.

“I was able to play with [Jets receiver] Brandon Marshall for a long time and I learned a lot of my game from him,” said Bennett. “Now to be with another great player like Rob, he does so many things well, when you watch tape (you can’t see all of it) but when you’re right next to him, you’re like, ‘Man this guy’s really, really good. Hey Rob, how’d you do that? How’d you do this? Man, show me that. Come to the side real quick and show me how you did that move.’

“It’s just give-and-take, sometimes he asks me, ‘Hey man, you did this today, I like that. Show me that,’ " he explained. “So we’re just working trying to make each other better and I think that’s what the whole tight end room is trying to do.”

Bennett’s been pigeonholed a bit as a quirky guy with great talent but intermittent intensity. Right now, the intensity’s been flowing freely.

“I ended up on IR in like November [last season] so I really haven’t had that much football for a long time so it’s really, really good (to be on the field),” he said. “It’s like when you break up and get back with the girl that you love in the first place, so it’s been great to be back out there.”

Can Bennett, who has one year left on the deal he signed with Chicago before the Patriots traded for him, see himself sticking in Foxboro past 2016?

“Yeah,” he began before adding. “I’m not thinking about next year right now. I’m just trying to have as much fun as I can this year. Football can be taken from you at any time. I didn’t get to finish the season last year. To me it’s just a joy to be out there playing and enjoying the game and enjoying the process. I’m just worried about my todays.”