Ruben Amorim says it is "really clear" Manchester United are being drawn into a relegation fight following their 2-0 loss to Newcastle at Old Trafford.

The Portuguese admitted his team's situation was "a little bit embarrassing", with defeat on Monday night leaving them seven points above the Premier League drop zone in 14th.

They have lost four successive games in all competitions and five of their last six league games, including their last three at home.

Asked if he sensed United were being drawn into a relegation battle, Amorim said: "That is really clear and we have to fight.

"We have to acknowledge our position ... we have to win games and focus on surviving.

"It's a very difficult moment and we have to fight for the next game and to implement the idea to win games and to have also performance, because I think we are losing some things from the last games."

United were dismal in a first half that saw Newcastle score through headers from Alexander Isak in the fourth minute and Joelinton in the 19th, and hit a post via Sandro Tonali.

Amorim made a tactical adjustment in the 33rd minute as Joshua Zirkzee came off to an ironic cheer from the crowd, replaced by Kobbie Mainoo.

Zirkzee initially went down the tunnel before returning, and Amorim said: "He wanted to be (in dressing room) and then he returned in the second half.

"It was a very difficult moment and he is a human being, but then he felt the support of the fans in the end so everything is OK."

United improved in the second half, but Harry Maguire's header hitting a post was the closest they came as Marcus Rashford watched on from the sidelines, having been restored by Amorim to the matchday squad as a substitute after a four-match absence. He did not make it on to the pitch.

The Magpies rose to fifth with their fifth win on the bounce, fourth in the league, and first league victory at United since 2013.

"We know the hurt this fixture has had for us historically, it wasn't lost on us," Newcastle boss Eddie Howe said.

"We didn't necessarily use that with the players, but psychologically that was a big step forward for us today.

"... I thought we managed the game really well and played really well in the first half. I was delighted with the team."

While Newcastle go to Tottenham on Saturday, United's next match is a trip on Sunday to league leaders Liverpool.