PHOENIX -- Cardinals third basemen Scott Rolen will undergo a CT scan in St. Louis Thursday night to determine the extent of a shoulder injury he suffered during a seventh-inning collision with Diamondbacks pinch-runner Alex Cintron.

	Scott Rolen's status for the rest of this series is still unknown after this seventh-inning collision.

Though original X-rays were negative and doctors diagnosed Rolen with merely a sprained left shoulder, he was unable to lift his arm after the game. He also needed teammates to help him get dressed and is concerned about his status for Saturday's Game 3 of the National League Division Series, if not longer.

Rolen, gingerly holding his arm at his side, said after the game that the pain was actually getting worse, not better, as time went on.

"It's a sprain in the one joint, but they're worried about the other (joint)," he said.

Cardinals manager Tony La Russa went on to hint that he didn't expect positive results from the CT scan.

"You know, the news is probably not too good," he said. "His continuing to play for us in this series is very questionable. We'll have our fingers crossed, but I think there's a chance that he might have played his last game."

The play happened in the seventh inning, when Rolen was fielding a ground ball hit by Arizona second baseman Junior Spivey. Cintron, who entered the game as a pinch-runner for Chad Moeller, was running from second to third on the 3-2 pitch, and collided with Rolen just as he bent over to field the ball.

	“	You know, the news is probably not too good. His continuing to play for us in this series is very questionable. We'll have our fingers crossed, but I think there's a chance that he might have played his last game. ”
		— Tony La Russa, Cardinals manager, on Scott Rolen

Cintron's hip drove itself right into Rolen's shoulder, causing the third basemen to immediately spin and crumble to the ground. Rolen laid on the ground for a few minutes and then was helped off the field by St. Louis' medical personnel. Rolen said he thought he had broken his collarbone.

"As soon as he hit me, I knew something wasn't right," Rolen said. "I have never felt a pain like that before in my life."

In 55 regular-season games since joining the Cardinals via trade on July 29, Rolen hit .278 with 14 home runs and 44 RBI. In Game 1 of the Division Series on Tuesday night, he clubbed a massive 427-foot homer off of Randy Johnson. He was 2-for-2 in Game 2 before the injury.

And just recently, he signed a eight-year, $90 million contract extension to stay with the Cardinals.

"I can't stop thinking about it," La Russa said. "My heart is really warm about the way we are playing, but I'm sick to my stomach about Scott."

Rolen said he held no resentment towards Cintron whatsoever.

"The ball, myself and the runner all got there at the same time," he said. "He was just trying to make an aggressive play. That's how you play the game."

Interestingly enough, Arizona left fielder Luis Gonzalez, who injured his shoulder in a collision last week against the Cardinals and is out for the remainder of the postseason, threw out Thursday's ceremonial first pitch.