UEFA have confirmed they are investigating a formal complaint by Manchester United about "alleged racist conduct" by Benfica fans during the recent Champions League fixture.

United made the complaint following the 1-0 victory in Lisbon last month when several Red Devils players were allegedly targeted by sections of the Estadio Da Luz crowd.

A UEFA statement on uefa.com said: "UEFA is investigating a written complaint made by Manchester United FC about alleged racist conduct by spectators at the UEFA Champions League Group F match against SL Benfica in Lisbon on 26
September.

"The English club has submitted the complaint, following allegations by United players that they were subject to abuse of a racist nature at the game in Portugal, which United won 1-0."