Purdue started the season with five healthy running backs. After one game, the list has been reduced to four. First-year coach Jeff Brohm said Monday that junior Markell Jones might miss a “couple weeks or more” after sustaining a knee injury in Saturday’s loss to Louisville. “He’s had a good fall camp and he's really been into it, so it's unfortunate that this has knocked him out a little bit,” Brohm said during his weekly press conference. As the Boilermakers prepare for Friday night’s matchup against Ohio, they’ll lean on Tario Fuller, D.J. Knox and Richie Worship at the running back position. Fuller and Knox combined for 12 carries and Worship and Brian Lankford-Johnson each had one. Jones was a big part of the game plan against Louisville, but the former Indiana Mr. Football suffered the knee injury during a kickoff return. Jones also fumbled on the play. “We had a pretty good game plan going in to get him the ball, even in the passing game and that kind of was wiped out pretty early,” Brohm said.