Marcos Alonso has warned his Chelsea team-mates that Jose Mourinho's Manchester United side will be looking for revenge on Sunday, reports the London Evening Standard.
Chelsea have already beaten Mourinho's team twice this term and are looking to make it a hat-trick of wins against their former boss at Old Trafford this weekend.
"It will be tougher this time around. They are one of the best teams in England, no doubt. It will be a very hard game, even more so after losing twice against us.
"They will give even more to try and beat us. We will have to do the same or more than before to get another win.
"They're playing at Anderlecht tonight but they have a big squad, full of good players.
"They will be hard to beat, no matter who they pick or the fact they're playing in the Europa League just three days before. We will have to be ready."