Cardinals wide receiver Marvin Harrison Jr . left Sunday's 31-27 loss to the Colts in the second quarter and did not return after suffering a concussion. Harrison banged his head on the turf inside Lucas Oil Stadium after a tackle and was slow to get up before being evaluated by team trainers and being taken to the blue injury tent.

Playing in his first game at the home of his Pro Football Hall of Fame father who starred in Indianapolis, Harrison walked to the locker room with 6:59 left in the first half after finishing with two catches for 32 yards. This is Harrison's second concussion sustained in the NFL after he suffered his first last season in Week 6, and he'll need to clear the league's mandatory concussion protocol before being cleared to return.

With Harrison sidelined

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