Ruben Amorim says he has "no idea" how long it will take to fix Manchester United's problems after their 2-0 defeat to Wolves.

United fell to their fourth defeat in their last five Premier League matches after goals from Matheus Cunha and Hwang Hee-Chan, with Bruno Fernandes also being sent off for the third time this season to compound their misery.

It was Amorim's fifth defeat in just 10 games in charge, making him the first manager to endure such a run in all competitions since Walter Crickmer in January 1932 (lost six of his first 10).

The 39-year-old admitted he could not give a timeframe for when United's fortunes could improve. 

"The idea needs time," said the Portuguese head coach.

"I said it before to you guys that this will be a tough moment, and we are far from the end of this moment and that's it."

When asked how long he thinks it would take for an upturn in performances and form, Amorim said: "I have no idea. No idea. Instead of me trying to understand how much time it will take, just day by day."

United are in 14th place in the Premier League but face a tough run, with Newcastle United at home before travelling to face rivals Liverpool at Anfield and Arsenal in the FA Cup.

The Red Devils have now suffered as many defeats in their last five Premier League games as in their previous 15 matches in the competition (W7 D4). Indeed, only Everton and Southampton (both nine) have failed to score in more different games this season than their seven.

"In this moment, we just have to survive and to win some time to work on the team," Amorim said.

"We already knew it. I start this job, and you start with the team, a new idea, without any time to train, with a lot of games, tough games.

"It's a long journey, like I said in the first day. We have to continue, and we have to fight these bad moments because this is part of football."