Collison (coach's decision) didn't see the floor in a 126-121 loss to the Trail Blazers on Wednesday.
Collison hasn't played in any of the Thunder's games since Feb. 11, and has made all of 14 appearances on the season while averaging a career-low 5.8 minutes per game. It's looking like it could be the end of the line for the 36-year-old, who will become a free agent this summer.