Results have since soured and the club were knocked out of the Champions League and FA Cup. Last week Man United were beaten by Everton 4-0 in a fifth consecutive away defeat.

Keane believes it is the players, not the manager, that is the problem at Man United.

Speaking on Sky Sports ahead of the Manchester Derby, Keane said: “These are the same players who threw (Jose) Mourinho under the bus and they will do exactly the same to Ole.

“Leopards don’t change their spots. There’s too many bluffers at this club to get United back to the very top.

“Even the point that we’re talking about Man United trying to finish fourth tells you how the standards have dropped over the last few years – both on and off the pitch.

“It’s a big test for Ole as well of course.”

Keane added: “It’s not up to the manager to motivate the players, the players have to motivate themselves.

“You’ve got to be up for every game at Manchester United and the fact that Ole’s got to discuss it after the game and again the following few days about his players not being up for a game of football, he must be hugely embarrassed.”

"These are the same players that threw Mourinho under the bus and they'll do exactly the same to Ole." 😳

Roy Keane doesn't hold back when assessing @ManUtd's current state...😈

Watch the @premierleague clash live on Sky Sports PL now: https://t.co/h8IlNQKl7S pic.twitter.com/9yC9puvzCO

— Sky Sports Premier League (@SkySportsPL) April 24, 2019

Keane was critical of Man United midfielder Paul Pogba, saying after an interview Sky Sports showed with the player that "he is a big problem".

“He’s on about being a team-mate, well if you want to be a good team-mate you’ve got to run back," Keane said.

“He is a big problem, no doubt about it.”

- additional reporting by Press Association