An MRI exam taken Tuesday showed no serious damage to the right foot of Washington Redskins quarterback Kirk Cousins, a person familiar with the situation said.

Cousins was found to have suffered no significant ligament damage in his foot, the person said, speaking on the condition of anonymity because the team did not announce the MRI results. The person said Cousins is expected to be available when the Redskins open the regular season Sept. 9 against the Philadelphia Eagles. The Redskins called the injury a mild mid-foot sprain after the game and hoped nothing more serious would be found.

Cousins left the Redskins’ preseason game Monday night against the Pittsburgh Steelers after being hurt in the second quarter. Cousins grabbed his foot after being hit on the sideline by Steelers linebacker Lawrence Timmons at the end of a run. X-rays taken Monday showed no fractures, and Redskins Coach Mike Shanahan said after the game the team was hopeful that Cousins had not suffered a serious injury. Tuesday’s MRI was to determine the possibility of something more severe, such as a Lisfranc mid-foot injury.

Cousins has started the Redskins’ first two preseason games while starter Robert Griffin III is eased back toward full-time duties after undergoing knee surgery in January. Cousins is a valuable insurance policy as a backup, having secured a significant victory for the Redskins last season in Cleveland in his first NFL start while Griffin was hurt. Cousins worked with the starting offense during offseason practices and at the team’s training camp in Richmond while Griffin rehabilitated.

Griffin was examined Monday by orthopedic surgeon James Andrews and is to be re-examined by Andrews following the preseason, after which he will make a recommendation to the Redskins regarding Griffin’s playing status for the regular season. Griffin has said he has no doubt he’ll be ready to play against the Eagles. Shanahan has said he expects Griffin to be ready for the opener barring a setback. He also has said that Andrews felt the same way Monday.

The Redskins play their third preseason game Saturday against the Buffalo Bills at FedEx Field.  If Cousins joins Griffin on the sideline, as now seems probable, Rex Grossman and Pat White likely would split the snaps at quarterback relatively evenly. The Redskins close the preseason at Tampa on Aug. 29.