Manchester United have asked for CCTV footage to help identify fans
Manchester United have asked for CCTV footage to help identify fans who sang a controversial song about striker Romelu Lukaku during Saturday's win at Southampton.
Lukaku, 24, asked fans to "move on" from the chant on Friday.
However, the song was heard in United's 1-0 Premier League victory at St Mary's Stadium.
United said they will "take further action against individuals if this continues".
A statement read: "The club and the player have been clear in asking for an end to the chant.
"The club is in discussion with the police and has asked for CCTV footage from Southampton."
United said they have a "zero-tolerance stance" on offensive chanting and behaviour.