United's winless run stretched to four games, following their 0-0 draw with the LaLiga club in the Champions League on Tuesday.
It was a tense game for both sides and it was clear that Valencia meant business despite being surrounded by Red Devils fans roaring on their team to advance and attack.
The Argentinean was able to play a major role in the famous Hammers win at the weekend and his comments on the state of Manchester United were stunning in their bluntness.
On his defenders' performance, the Portuguese said: "They tried, they raised the level of their intensity".
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Ederson lines up between the sticks for Manchester City , while at the back Guardiola picks Nicolas Otamendi and Aymeric Laporte. It will be a really tough game , but we know that and we will try to do a good game '.
Despite the lack of chances created, Mourinho was satisfied with what he saw from his under-pressure team.
United were nearly punished in the 72nd minute after Batshuayi's searching pass found Guedes who darted off from inside his own half before missing a one-on-one chance against De Gea.
"Freedom of speech, especially Manchester United fans that I respect 200 percent", he said.
Although Mourinho may be on borrowed time, with United nine points off the pace in the Premier League after they were also dumped out of the League Cup by second-tier Derby County, the current squad look unlikely to start firing on all cylinders under another manager.
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"I'm actually slightly surprised he survived after Saturday, the performance was so bad", he told BT Sport.
"I was asked after the game if I still think he is the right fit - and I think he still could be".
"We have Newcastle before the league stops (for the global break) then we have Chelsea and Juventus in three days".
He is the manager and it is down to him to get the players to do exactly what he wants them to do on the pitch.
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Barcelona will have to stop Spurs striker Harry Kane , who hit two at Huddersfield on the weekend after a spell out of form. When you're scoring as many goals as he is - 40, 50 or 60 goals a season - as a striker, I want to try and match that.
" I am not interested in that, I don't need to know what Paul Scholes said". "I think you have enough reasons to criticise me", he said.