Rail operator Southern has apologised after crowds of football fans were left "stranded" when trains were cancelled at short notice after a match.
Chief executive of Brighton & Hove Albion football club Paul Barber said the disruption was "unacceptable" and he wanted a full explanation.
The football club said the rail operator made several late and unannounced cancellations just before the end of the match "creating chaos".
Mr Barber said: "It's totally unacceptable from Southern rail to leave passengers stranded in this way and we will be demanding a full explanation from them as to why they so badly let down supporters of both clubs."
He thanked both Brighton fans and Aston Villa supporters for their "patience and understanding in frustrating circumstances".