Ahead of Tuesday's Champions League clash with Valencia, Mourinho insisted he doesn't fear for his job but refused to state whether he had met with the club's executive vice-chairman Ed Woodward in the past few days.
Pellegrini added that because he hasn't played consistently well over a complete season the timing for Arnautovic to head to an elite side is not right. "Even if some players didn't like what the plan was they bought into it and did the job 100 per cent".
United, who kicked off eight points adrift of leaders Liverpool, were behind as early as the fifth minute at the London Stadium, when Felipe Anderson opened the scoring for West Ham.
The German defender also opined that the self-styled Special One's confidence was low at the moment.
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He said: "We have to look at ourselves as players".
Manchester United have lost just one of their last 18 Champions League group stage games at Old Trafford (W12, D5), a 1-0 defeat to CFR Cluj in December 2012.
Mourinho was also quizzed about a report which claimed he was already preparing for his Old Trafford exit after receiving a call from Zidane, the favourite to replace him.
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Here, we take a look at the other four sides to have had a maximum return after the first six games of a Premier League season. "So, if Virgil is fit and can play then he will play, but if not then obviously we have options and that's really good".
The France worldwide has had the vice-captaincy taken off him and many observers are claiming Mourinho may be suffering from the "third-season syndrome" that has dogged his career. Now, he believes current boss Mourinho is changing things far too often at United to allow his players to get any rhythm and have any success.
"Games like this [at West Ham] we should be dominating, creating chances, showing people why we deserve to play for Manchester United". "The players all know the situation is not good and we know we can do better".
Matic admitted that United's slump in form has put more pressure on the players as United prepare to face Valencia and Newcastle at home before the worldwide break. I can say that in the club everyone is giving his best to do better for the team. "And I will improve the things that depend on me and my work".
Nemanja Matic spoke alongside Mourinho at the news conference and admitted United need to improve quickly during a hard period for the club.
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