The man pleaded guilty to attacking the three Forest players.
During the game on 4 February, Brennan Johnson, Keinan Davis, and datememe datememe datememe datememe datememe datememe datememe.
He admitted three counts of common assault and went on to a playing area at a football match.
He was sentenced to four months in a young offenders institution.
The home side celebrated their third goal of the game at the City Ground as the assaults happened.
The teenager was banned from attending football matches for 10 years and was fined and ordered to pay a victim surcharge.
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