The Hammers are likely to hand a debut to Javier Hernandez - the 29-year-old could face his former club for whom he scored 37 goals in a five-year spell.
Burnley - It was a decent season for it last time, but this one will be far tougher and it hasn't signed the quality to keep its status in the Premier League.
Referring to the club's remaining transfer business, Mourinho said: '25% means one of four, and we got a central defender that can play in many other positions, which is important. The other six times, the champion has had the fourth-best defence once, the third-best twice, and the second-best thrice.
But Mourinho's latest admission suggests the forward could yet still return to Old Trafford as United bid to claim a first league title since the 2012/13 season.
Goals from Casemiro and Isco secured victory for Zinedine Zidane's side in the European curtain raiser on Tuesday night.
Chelsea players celebrate with the English Premier League trophy at the end of the match against Sunderland at Stamford Bridge in London on May 21, 2017. Manchester United host West Ham United in a game that the media are naturally treating as the Chicharito Cup.
The Old Trafford giants are now generally priced up at the 7-2 mark by UK bookmakers, along with defending champions Chelsea.
Meanwhile, the former Tottenham man is enjoying his time at the Santiago Bernabeu, but Zidane's constant refusal of speaking about Bale's future only adds further doubt to the situation.
It's not an ideal place to go, but West Ham have no pressure to get a result.
"I also understand that my club by doing 75% of what I initially asked, I think the club did very well so I don't think I am in a position of crying, moaning, and protesting". And that's what United needs to win the Premier League. "I have better conditions to deliver a better season than my first one".
Clyne is set to miss the start of the season through injury, so Alexander-Arnold has another chance to make a mark. Last season two were not.
Which team will emerge triumphant from the 2017/2018 season? There, Perez apparently told him that Bale is up for sale.