Lukaku, a £75 million (US$97.3 million) capture from Everton, could be one of three players making league debuts for United on Sunday along with Victor Lindelof and Nemanja Matic. "I worked with Mourinho and I became his friend as well", the 29-year-old told Goal.
Since moving to Stamford Bridge Willian has become an important part of the squad and has made a total of 182 appearances where he scored 31 goals and provided 27 assists across all competitions.
Another player sent out on loan by Chelsea, the 22-year-old Loftus-Cheek looks sure to get plenty more first-team action at Palace either in central midfield or in the No. 10 role behind the striker. "We were focused on the striker scoring goals and when it didn't happen we were in trouble".
He said: "I feel the way people analyse [Pogba] is really unfair".
But Mourinho was nevertheless impressed with his former Chelsea charge: "I think he played really well, I think in the moment they were moving the ball well of course was hard for us in the midfield".
"We lost only one match at home and in the cups we never lost, but too many draws". If we manage that, we'll try to finish in the top two.
However he has also proven to be a combustible presence and has only once begun a fourth season at a club, lasting little over a month into that campaign during his first spell at Chelsea.
With the exception of Luke Shaw, Marcos Rojo, Ashley Young who have all been carrying injuries since the back-end of last season, everyone is fit and ready to be involved on the opening day.
He suggested few fancied Chelsea's title chances this time previous year and not many would back the Blues now.
"I'm going to fight for them".
"I don't think I am going to win it because I always win it in the second season".
Yet, a team featuring Sergio Aguero and Gabriel Jesus up front and a sprinkle of attacking midfielders like Kevin De Bruyne, David Silva, new signing Bernardo Silva, Leroy Sane and Raheem Sterling promises lots of goals this season.
"Anthony Knockaert seems to be one of Brighton's better players".
"I saw last season how tough the league is - it doesn't matter who the top teams are".
The way Pep Guardiola and Jose Mourinho have been spending, the Premier League trophy should be returning to Manchester in May.
Lukaku faces the greatest scrutiny, having been brought in to replace Zlatan Ibrahimovic after the charismatic Swede was released in the wake of the serious knee injury he suffered last season.