This is the latest setback for a player regarded as the Bulldogs' top receiver heading into the 2013 season.
Georgia officials say Mitchell underwent arthroscopic surgery Thursday after injuring his right knee while running routes this week. Director of sports medicine Ron Courson says a full recovery is expected, but there's no timetable for Mitchell's return.
The junior initially tore a ligament in his right knee in last season's opener against Clemson, knocking him out for the rest of the year. He then hurt his left leg during spring practice and missed the remaining workouts.
Mitchell had 40 catches for 572 yards and four touchdowns in 2012.
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