After the game, the striker hit back at the former player, as he told Viaplay: "I really don't care about that man."
Now Keane has taken to the feud up another notch by labelling Haaland a "spoilt brat" on live TV. Speaking on Sky Sports, the ex-United captain said: "I think we saw Haaland yesterday brought off not too happy, behaving like a spoiled brat. I think when you have the spat as well with the manager and obviously your star man, it doesn't help that results aren't going your way. But because they win the game, he scores goals it's almost forgotten about."
When asked if it was okay to be disappointed with Pep Guardiola's decision after a stellar show on the pitch, Keane added: "No, no. No, it's not." He then glared at Sky Sports host David Jones in an awkward moment that left the whole studio in silence.