ASHBURN, Va. -- Washington Redskins running back Derrius Guice underwent knee surgery to repair his right meniscus and will miss six to eight weeks, a source told ESPN's Adam Schefter on Thursday.
The injury also creates an opening for Adrian Peterson to start just one week after he was a healthy inactive for the season opener.
Guice tore his meniscus in Sunday's 32-27 loss to the Philadelphia Eagles. The Redskins initially hoped he would only miss a couple weeks, but the knee didn't show any improvements in the days after the game.