PORTLAND, Oregon — The Trail Blazers could be without two of their starters when they meet the Celtics tomorrow night.

Brandon Roy injured his right hamstring in Portland’s game against Toronto and participated in only a portion of the Blazers’ practice today. Greg Oden injured his left ankle near the end of that practice and was taken for X-rays, which were negative.

Both are being listed by the team as questionable for the Celtic visit.

OAKLAND — Kendrick Perkins will not play tonight against the Warriors because of a strained left shoulder.

According to Celtic trainer Ed Lacerte, Perkins is being listed as day to day.

The center suffered the injury in the first quarter against the Lakers Thursday when his shot was blocked by Luke Walton. After the game, Perkins was icing the shoulder, but he said the problem was not serious.

As opposed to Game 4 against the Lakers last June when he dislocated the same shoulder (and had surgery on it over the summer), Perkins said this was more of a bruise.

“It kind of caught me off guard,” said Doc Rivers of the injury. “I knew he hurt it last night and I knew he’d get treatment this afternoon, but I just assumed that he would play. On the bus ride (to the arena) is when I got the call.”

Rivers said that Leon Powe would likely start, but he left open the possibility that Brian Scalabrine could open in Perkins’ place.

Paul Pierce will be on the Celtics’ charter to Atlanta in a little less than two hours, and he expects to play tomorrow night against the Hawks.

The captain injured his left knee late in last night’s win over Utah when Mehmet Okur rolled into him.

According to trainer Ed Lacerte, Pierce suffered a bruise. His definitive status for tomorrow will be determined after the morning shootaround.

Tony Allen missed tonight’s game against Indiana with a sprained right ankle, after originally suffering the injury during Monday’s win over Orlando.

An MRI will be taken on the ankle today. Cs trainer Ed Lacerte told coach Doc Rivers that the guard could return for Sunday’s game in Indiana, though a return for Friday’s game against Portland wasn’t ruled out.

Sam Cassell dressed to fill out the roster tonight.

The Celtics are said to be well aware that Antonio McDyess is likely headed back to the Pistons once he clears waivers, but the club is still hoping Danny Ainge can use his power of persuasion to get the big man into green. …

Rajon Rondo was wearing a few wraps after Sunday’s game against Detroit, but he reiterated that his hurts are nothing more than nicks.

Asked if Rondo twisted his ankle, Doc Rivers said, “He twisted his body.” …

Big treat tonight: Former Celtic Dino Radja is in town and was reminiscing before the game. He’ll also be at Friday’s duel with Denver. …

Rivers said he’s figured out the problem behind the Celts’ slow starts.

“The starters,” he said.

Still, it would be wise not to expect any lineup changes. …

The coach said Tony Allen has been “up and down” this season, and even after his 23-point performance against the Pistons, Rivers is most pleased with Allen’s defense. …

Stray non-basketball thought: How many more games do the Titans have to win before Mercury Morris gets dusted off so he can a household name in Nashville?

The Eastern Conference just got a whole lot more interesting.

Unable to shake up his roster during the offseason, Pistons president Joe Dumars needed just a couple of regular-season games to get the job done.

Multiple reports are saying that Dumars has dealt Chauncey Billups and Antonio McDyess to the Nuggets for Allen Iverson.

Iverson back in the East makes for some interesting matchups with the Celtics.

Success comes with its rewards.

The Celtics today promoted Danny Ainge from Executive Director of Basketball Operations to President of Basketball Operations. They also extended his contract in the process.

“I have a good relationship with the owners and I still enjoy the experience,” said Ainge. “This doesn’t really change what we’re trying to accomplish, but I’ve appreciated the support they’ve shown me all along.”

In a statement, Celtics managing partner and co-owner Steve Pagliuca said, “Danny has been a key part of building our World Championship team and basketball program. He represents all that is the best of Celtics Pride and we applaud his success.”

Ainge, who constructed the reigning NBA champion Celtics roster, thanks in large part to trades for Ray Allen and Kevin Garnett, was the league’s Executive of the Year last year. He is in his sixth year running the C’s.

“Danny was visionary as he assembled the players who brought home our 17th banner,” said managing partner and CEO Wyc Grousbeck in the statement. “His work ethic, character and insight earned him Executive of the Year and earned us a world title.”

 The Celtics waived free agent signee Darius Miles today, bringing their roster down to the maximum of 15.

“Darius was a model citizen during his time here in Boston,” said GM Danny Ainge. ”He showed that he still has a lot of basketball left in him.”

As the only non-guaranteed contract of those in camp, Miles was the best bet to be cut. And when he didn’t wow the coaches with his game (after missing the last two seasons following knee surgery), he was gone.

Celtics coach Doc Rivers will not be on the bench tonight for the team’s exhibition opener against Philadelphia at the Mullins Center in Amherst. Rivers had to return to Orlando to attend to a family issue.

The Celtics announced today that they’ve signed free agent forward Darius Miles. Miles, a 6-9 forward, has not played the last two seasons due to a right knee injury.

Drafted in 2000 as the third overall pick by the Los Angeles Clippers, Miles has posted career averages of 10.6 points and 5.2 rebounds. He last played for the Portland Trail Blazers, scoring 14 points and pulling down 4.6 rebounds in 40 games in the 2005-06 season.

“Darius has been in twice for workouts with us and has impressed us with his progress, health and attitude,” said Celtics GM Danny Ainge. “Darius will have the next couple of months to prove to myself and Coach (Doc) Rivers that he can help us win.”