Luton Town have confirmed they will immediately issue a stadium ban for a fan who appeared to hit out at Amad.
The Hatters booked their place in the Championship play-off final on Tuesday night after they overturned a first-leg deficit to knock out Sunderland. The Black Cats took a 2-1 lead to Kenilworth Road, but lost 2-0 on the night to end their season.
The defeat also marked the final game of Amad’s impressive spell Wearside. The winger, who signed for United in a deal worth £37.5 million, has flourished under Tony Mowabray in his first full season of senior football.