Roy Keane and Gary Neville clash over Manchester United after Liverpool humbling

Former Manchester United skippers Roy Keane and Gary Neville couldn't see eye to eye in a fiery debate over the positioning of full-backs during United's possession, following a crushing 3-0 defeat to Liverpool .

The pair witnessed Casemiro's errors lead to Luis Diaz's double before Mohamed Salah sealed the deal shortly after half-time, sparking a major post-match analysis on Sky Sports. While dissectining United's shortcomings , Keane and Neville clashed.

Neville kicked off the discussion, lamenting: "This isn't high pressing or brilliant defensive work, United's play in those deep areas was absolutely terrible."

• Mohamed Salah says 'it's my last year at the club' in terrifying warning to Liverpool bosses
• Sir Jim Ratcliffe's reaction to Liverpool's Old Trafford rout sums up Manchester United

Keane chimed in with: "It's when they lose it with the full-back, the shape is all wrong."

Sky Sports host Dave Jones prompted Neville for his take on Keane's comments, to which he responded: "No, it's not. They're individual errors that are in terrible areas. When we played at United, Dennis Irwin and I would go forward and leave the centre-backs with Roy Keane or Paul Scholes. If they give the ball away, we'd be in trouble, but they didn't do it often."

Keane countered: "They didn't do it that high, Gary. They wouldn't be that high, not the two of you. At this level, you expect to do better but it shouldn't be so simple that one mistake, one pass and someone is in on goal, it shouldn't be as simple as that. But it is.

"We've seen it a few weeks ago, this one - (Kobbie) Mainoo has to do better. He's had a good few months but look at this, I don't think that should happen. The two full-backs are coming back into the picture, if you see your midfield on it you should fear the worst."

Neville disagreed firing back: "Roy, I'm not sure. As the ball used to travel in, I'd fly forward."

Disgruntled, Keane said: 'No, no, no" - before interrupting Neville with: "Absolutely not. Not when he's got his back to play, if I'm facing up the pitch, I'd expect you to be running but not when he's not in proper control of that. Unless you see your mate in control of that. As a defender, expect the worst, expect your mate to lose it. They're on the outside looking in, they should be back inside, then if you see your mate in a good position you go, 'I can run onto it'. That's what I think."