Stanford athletic director Bernard Muir apologizes for 'unacceptable' artwork in volleyball locker room

Stanford wins 8th volleyball national championship (1:03)

Meghan McClure comes up with the kill for match point to secure Stanford's eighth national championship, the most all time in NCAA history. (1:03)

MINNEAPOLIS -- Stanford athletic director Bernard Muir issued an apology on Saturday, a few hours after a post on Twitter showed a drawing on the whiteboard in the Cardinal women's volleyball locker room depicting the Stanford tree -- the Cardinal mascot -- making a crude gesture toward Herbie Husker, the Nebraska mascot.

The photo was taken while the Stanford women's volleyball team celebrated its second NCAA championship in three years.

Shortly after the Cardinal won the five-set match over Nebraska at the Target Center, NCAA Volleyball posted a celebratory photo from inside the Cardinal locker room. The tweet was deleted, but not before several Twitter users took screen shots and shared them on Twitter.

Muir's statement reads: "We are aware of a picture taken in our team's locker room following the NCAA Women's Volleyball Championship and posted on social media. The image in the background of the picture is unacceptable and does not reflect the values of Stanford University. We have reached out to our colleagues at Nebraska to express our sincerest apologies to the university and its women's volleyball program. We regret detracting from what was otherwise a great night for the sport of women's volleyball."