USC's running back depth took a serious hit during its 31-13 win over Michigan on Saturday, which caused a running back that was initially ruled out on the Big Ten pregame injury report to play. USC running backs Waymond Jordan and Eli Sanders both exited the game against the Wolverines and didn't return, causing Bryan Jackson -- who hadn't played since Week 1 due to a turf toe injury -- to play.

After the game, Riley addressed why Jackson played, citing it was a "wellness issue" and that the program was in contact with the league office. Jackson's first carry of the night came midway through the fourth quarter.

"Unique situation," Riley said. "It was a wellness issue obviously in the game. He has been practicing in a very limited capacity in the build up the last several weeks.

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