The English Football League (EFL) have condemned the "unsavoury and unacceptable incidents" taking place at football stadiums.
In a strongly-worded statement, the EFL reminded supporters of the safety threat that pitch invasions can have, as well as reiterating that it is a criminal offence to enter the playing surface at any time, and consequences include bans as well as a criminal record.
The statement comes after Sheffield United captain - and former Reds striker - Billy Sharp was allegedly "assaulted" by a Nottingham Forest fan after the second-leg of the Championship play-off semi-final clash at the City Ground, a tie settled in Forest's favour after a penalty shoot-out. Nottinghamshire Police have said a man was arrested “after a footballer was assaulted on the pitch” at the end of Tuesday night’s game.