Manchester United have five players at risk of suspension in the Champions League.
Rules stipulate a player is handed a one match ban after picking up three yellow cards which means five United players know a booking in the Champions League quarter final first leg against Barcelona would rule them out of the second leg at the Nou Camp.
Ander Herrera, Ashley Young, Luke Shaw, Antonio Valencia and Nemanja Matic all currently have two yellow cards which means another booking for any of them on Wednesday night would rule them out.
The only Barcelona player at risk of a suspension is right back Nelson Semedo.
The Spanish side revealed their travelling squad on Monday afternoon ahead of the quarter final clash with Ousmane Dembele named as one of the 22 players.
The Frenchman has been sidelined for the best part of a month with a hamstring problem but was included in Ernesto Valverde's 22-man travelling squad for the game, named on Monday afternoon.
He is expected to undergo a late fitness test to determine whether he will be available to play some part against United.