Aston Villa boss Steve Bruce is convinced Jose Mourinho will have Manchester United attack Liverpool.
Bruce who won three Premier League titles during his nine years under Sir Alex Ferguson insists his old side will go all out for the win.
Bruce told talkSPORT: "They can't park the bus.
"The supporters will demand that they go and have a go at them,that is for sure.
"You are going to have to defend well because Liverpool's undoubted strength is the front three and the pace of the front three.
"They are fantastic to see at the moment Liverpool but they [United] will have a game plan that they can't be caught on the counter-attack so be careful of it.
"United v Liverpool at Old Trafford, there is no bigger occasion, so I hope it is a proper spectacle."