The man was sentenced to 24 weeks for attacking Billy Sharp at the City Ground.
Sharp required four stitches to a wound to his lip after Robert Biggs admitted assault occasioning actual bodily harm.
He was sentenced at the court.
The incident was caught on camera by the television cameras.
A large number of fans entered the field of play.
Mr Sharp wasn't directly involved in the game. He has his hands in his pockets.
The man can be seen running on the pitch. He headbutts Mr Sharp.
The Crown's case is that this is a deliberate act of violence.
The application for a football banning order was not opposed by the man in custody.
He was told that the charge of illegally entering the playing surface had been dropped.
The second leg of the Championship play-off final was level at 3-3 on aggregate and went to a penalty shoot-out, which Forest won thanks to Samba's three spot-kick saves.
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