Wesley missed the Trojans' 80-59 loss to Stanford and won't play Sunday against Cal. He is averaging 17.6 points per game and had scored 110 points in USC's previous five games.
With Wesley back home, Stanford (17-8, 8-5 Pac-12) overcame a slow start to race past the Trojans in the second half Thursday night after needing overtime to win at USC last month. The Trojans had one more turnover than made basket as they struggled to find any consistent scoring.
USC (10-16, 1-12) now has lost seven straight games under first-year coach Andy Enfield.
The Associated Press contributed to this report.