Report: 49ers WR Brandon Aiyuk out for season with torn ACL, MCL in loss to Chiefs Brandon Aiyuk was carted off the field after taking a hard hit directly to his knee on Sunday. Content Original Link: https://sports.yahoo.com/report-49ers-wr-brandon-aiyuk-out-for-season-with-torn-acl-mcl-in-loss-to-chiefs-210616923.html