Eagles' Westbrook out vs. Bears

LAKE FOREST, Ill. -- Philadelphia Eagles running back Brian Westbrook has officially been ruled out for Sunday night's game against the Chicago Bears.

"Brian is out," Eagles coach Andy Reid said Wednesday on a conference call with Chicago media. "Brian is in Pittsburgh having tests done."

Westbrook suffered his second concussion in three weeks during Philadelphia's loss to San Diego on Sunday.

That means the Eagles will turn to rookie LeSean McCoy in a backfield where the most experienced ball carrier is a fullback.

"I just want to help out the offense as much as possible," McCoy said Wednesday. "I never really expected to play a big role like this. But I got drafted for a reason. I have my chance, my opportunity and I have to make the best of it."

It's unknown if Westbrook will return at all this season.

"We'll know more on him as the next day or two go on," Reid said. "I talked to him on Monday and he was in a good place. I think he's grateful to have the care that he's had. He seemed to just want to find out what went on with this next one, but he didn't seemed rattled."

The Associated Press contributed to this report.