Cavaliers guard Daniel Gibson will miss Game 6 of Cleveland’s playoff against the Boston Celtics after separating his left shoulder during the second half Wednesday night.

Gibson, one of the Cavs’ best perimeter shooters, left early in the fourth quarter following a collision and did not return. The team estimated he would miss one to two weeks.

The Cavaliers trail 3-2 in the best-of-seven series and could be eliminated Friday night.

Gibson emerged as a star in Game 6 of last year’s Eastern Conference finals against Detroit.