ATHENS, Ga. -- Georgia running back Todd Gurley on Thursday was indefinitely suspended from competition by the UGA Athletic Association during an ongoing investigation into an alleged violation of NCAA rules.

"I'm obviously very disappointed," head coach Mark Richt said in a statement released by the university. "The important thing for our team is to turn all our attention toward preparation for Missouri."

Georgia (4-1, 2-1 Southeastern Conference) is ranked No. 13 in the Associated Press poll and plays at Missouri (4-1, 1-0) at noon ET Saturday.

Considered a leading Heisman Trophy candidate, Gurley is the Bulldogs' leading rusher with 773 yards and eight touchdowns with 11 catches for 53 yards. Gurley also is the team's leading kick returner, averaging 49.0 yards on three returns, including a 100-yard touchdown.

Gurley, a junior, ranks sixth nationally in rushing yards and Georgia is 12th overall, averaging 288 rushing yards per game.