"We are not a team that is very good when we lose possession and the other team counterattacks".
Left-back Shaw apologised to supporters for United's "awful" performance at the London Stadium and said the players needed to take a hard look at themselves.
United, who went two down before halftime with a Victor Lindelof own goal, offered a little resistance with a second-half goal from Marcus Rashford only for their central defence to be sliced open once more nearly immediately as Marko Arnautovic struck the Hammers' third. However, United defender Luke Shaw believed that the players should take the blamed and not the manager, Jose Mourinho. We had a very strong team.
"That's not good enough". The manager isn't on the pitch, is he?
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"We were not aggressive and intense enough to close that shot", Mourinho said.
United now look far from contenders, but they can take a huge step towards the last 16 by moving six points clear of Valencia in Group H on Tuesday.
"It doesn't matter how they set up, our game was to try to win, we have to do our job and we did it excellently, and that is why we deserved to win", he said. That shouldn't be happening. Games like this we should be dominating, creating chances, showing people why we deserve to play for Man Utd and that didn't happen. It was very poor from us.
Manchester United missed out on some key signings in the 2018 summer transfer window as their title rivals significantly strengthened.
Earlier, NAIJ.com had reported how former Real Madrid manager Zinedine Zidane is reportedly taking English lessons so as to prepare himself in case Manchester United decide to fire embattled Jose Mourinho. Sanchez is yet to score in five appearances and has been substituted in his last three starts, including being removed after just 63 minutes during the draw with Wolves. Andreas Pereira could also feature against Valencia, where he played 29 games on loan last season.