SEATTLE -- The Seattle SuperSonics aren't sure if they will have starting power forward Vin Baker this week because Baker's left shoulder is badly bruised.

Baker, a four-time former All-Star, can't lift his left arm over his head and was held out of the scrimmage during the Sonics' practice Monday.

He's listed as questionable for Tuesday night's game here against Portland. The Sonics also play Sacramento and Chicago at home this week.

"He's questionable for tomorrow," Sonics coach Nate McMillan said. "They said no contact today. We'll see tomorrow."

Baker, who is averaging 16.7 points, 6.7 rebounds and 34.3 minutes, went to the doctor Monday. He missed Saturday night's game at Indianapolis after being injured Thursday night at Milwaukee.

"It's a lot of pain right now," Baker said. "The pain doesn't seem like it's going to go away. I'm going to have to play with some pain at some point."

Despite missing Baker, the Sonics beat the Pacers 95-86 to finish a four-game road trip with a 3-1 record. They also beat Philadelphia and Milwaukee on the road and improved their record to 23-20.

Baker has bounced back this season after averaging career lows of 12.2 points and 5.7 rebounds last season. The Sonics tried to trade Baker, 31, during the off-season, but there were no takers for Baker's $87 million, seven-year contract.

He said the timing of his injury was disheartening.

"This is my first time having an injury like this," he said. "Hopefully, it'll get better by tomorrow."

The Sonics held two bench players, rookie forward Vladimir Radamanovich and guard Shammond Williams out of practice because they have the flu. McMillan said he didn't know if either player would be available for the game against the Trail Blazers.

McMillan said the Sonics were playing their best basketball this season. He said his team, which lost at Charlotte, should have won all four games on the road.

"I think it's the best we've played in the last couple of years," he said. "But we have a long ways to go. It's only January."