Nebrich, who was a highly touted recruit out of Burke, Va., spent his freshman season as a backup, seeing limited action. He had 69 yards passing, 60 of them coming in a Sept. 3 win over Fordham.
Nebrich's departure leaves UConn with four quarterbacks.
The Huskies also have sophomore Scott McCummings, who the team used last year as a running threat in an option-style package, and freshman Casey Cochran, who is recovering from a broken wrist on his non-throwing hand.
The Huskies went 5-7 last season, 3-4 in the Big East.