NFL Media Insider Ian Rapoport reported, per a source informed of the situation, that Pead will get an MRI tomorrow to confirm the tear.
The third-year back was well behind Zac Stacy, rookie Tre Mason and Benny Cunningham in the backfield pecking order, but was expected to make the squad due to his play on special teams. Now he will watch from the sideline.
The 50th overall selection in 2012 has just 17 carries for 75 yards, 14 receptions and 15 kick returns in two seasons. It's fair to wonder whether the second-round pick's time in St. Louis will end after the injury.