Darren Collison anded awkwardly on his left ankle on a drive to the basket in the closing minutes of the first half during Indiana's 96-90 loss to the Bulls in Game 2.

He limped to the locker room to be examined and did not return to the game.

Reserve A.J. Price started the second half and T.J. Ford also saw minutes at point guard. 

"I'm very concerned," said Frank Vogel. "(Collison) is a big part of what we do. You always miss your leader from a cohesiveness standpoint. Those guys filled in admirably. They played well."