Zastudil was placed on injured reserve last month, ending what had been one the best seasons in his eight-year NFL career.
Mangini provided little information Monday on Zastudil, who dropped 25 punts inside the 20-yard line before he was placed on IR on Nov. 22. Mangini only said "Dave had surgery a little while ago" when asked if Zastudil had undergone a procedure on his non-kicking, plant leg.
Zastudil was averaging 44.7 yards per punt and 39.1 yards net on 49 punts.
When Zastudil went down, the Browns signed Reggie Hodges, who is averaging 40.9 yards on 34 kicks.