Richardson broke a bone in his lower left leg Saturday against Michigan State and likely will miss the rest of the regular season, head coach Kirk Ferentz said Sunday night on his TV show. Richardson, who had battled back from recurring knee problems the past two seasons, started every game this season and played three different positions on the line.
Junior Julian Vandervelde or senior Dan Doering will step in for Richardson at right guard. Richardson suffered the injury minutes into the game.
"That was just a terrible thing to see," left tackle Bryan Bulaga told the Quad-City Times. "Not so much for us but for him. With everything he has been through, it's just awful."
Iowa running back Adam Robinson suffered a sprained ankle in the game, and his status will be monitored throughout the week. Safety Brett Greenwood and wide receiver Colin Sandeman both left the game after suffering apparent head injuries. Their status is unknown at this point.
Iowa (No. 4 BCS; No. 7 AP) resumes play this week against Indiana (noon ET, ESPN).
Adam Rittenberg covers Big Ten football for ESPN.com. He can be reached at email@example.com.