Minnesota Vikings wide receiver Percy Harvin, the reigning NFL Offensive Rookie of the Year, exited the practice field on a cart during this morning's practice, Judd Zulgad of the Star Tribune reports.

Harvin's injury was not disclosed, and Zulgad adds that no one saw what happened to him.

For more from Zulgad on the Vikings' morning practice, including Toby Gerhart's first action, click here.