Manchester United great Peter Schmeichel slammed three defenders after their 2-0 defeat at Old Trafford to Manchester City.
City cruised to victory at Old Trafford on Saturday afternoon after Eric Bailly scored a calamitous own-goal and Bernardo Silva struck just before half-time.
Silva capitalised on disastrous defending from Harry Maguire and Luke Shaw to find the back of the net from close range with some help from David de Gea.
"The second goal was a terrible goal to concede," the former goalkeeper told BBC Radio 5 Live. "David de Gea couldn't do anything initially, but my God, what are Harry Maguire and Luke Shaw doing on the back post?
"They should clear the ball. Maguire and Shaw both leave it, they both have the chance to clear it, thinking that either the keeper is coming out for it or that it's going out for a corner. Oh my God!
"David de Gea couldn't do anything about the second goal, it should have been cleared. The defending, I mean…"
The Dane also said: "We talked about this pre-game – what version of Eric Bailly will turn up today?
"He got away with a couple of similar situations on Tuesday, this time he didn't. To allow City to get the cross in when you have seven players in the box is not good enough.
"Two players at the back post could have scored if Bailly didn't touch that anyway, but Bailly should have easily cleared that for a corner."