Mane was benched for the clash and came on for Diogo Jota in the 74th minute but refused to shake his manager's hand at full-time as he marched towards the tunnel, shaking his head. The German played down claims of a rift and insisted he hadn't had the time to explain his team selection to the Senegal striker.
"No, there is no problem," said Klopp. "I made a late decision in training before the game to put Diogo in. The boys are used to me explaining things but there was no time for that. It is all fine. Sadio was slightly angry but that is all."
However, former Liverpool manager and Sky Sports pundit Graeme Souness claimed Mane's snub was "disrespectful" to both Klopp and to the club as a whole. He said: "It's disrespectful. It's never happened to me but if I were the manager, I would not be happy. I think he should have shaken his hand, he didn't want to cuddle, but you should show a bit of respect. It's most importantly disrespectful to the football club.
"Yeah, he's not happy at being left out, but can he really argue? He's not had a great season, how can he argue with the fact he's been a sub and Liverpool have won 4-2 at Old Trafford which is not a happy hunting ground for them."