Westbrook (face) is not expected to miss significant time off the court, although his official availability will be announced following a reevaluation sometime next week, Adrian Wojnarowski of Yahoo! Sports reports.
Collison moved into the starting lineup for Friday's game against Portland but ended up only seeing 12 minutes of playing time due to foul trouble. He finished with six points, three rebounds, and one assist.
Singler started his fifth straight game since being traded to the Thunder on Friday, but was held to just three points (1-5 FG, 1-3 3Pt), four rebounds, two assists, two blocks and a steal in 31 minutes.
Westbrook finished with a third consecutive triple-double in Friday's loss to the Trail Blazers, but more importantly, he suffered a facial injury to his right cheek with 1.4 seconds left in the game, and it remains unclear how serious the injury is, the Oklahoman reports.