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Warren (knee) is slated to undergo an MRI on his knee Monday, Nick Farabaugh of PennLive.com reports.

Coach Mike Tomlin said after Sunday's 20-10 win over the Chargers that he noticed Warren "wasn't running smoothly" and decided to pull the running back from the game, per Brooke Pryor of ESPN.com. Prior to exiting, Warren rushed just three times for 10 yards while securing his only target for minus-1 yard. If MRI results reveal an injury that could force Warren to miss any time, Cordarrelle Patterson will likely play an increased role against the Colts in Week 4, especially with Najee Harris (arm) having been spotted wearing a sling in the locker room Monday.

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