Yet Matic, whose parried shot created the opportunity for Lukaku to find the net, has no worries about his new colleague, citing the confidence boost that came with the goal.
Chelsea signed Tiemoue Bakayoko in a £40m deal from Ligue 1 champions AS Monaco to provide greater competition for places in midfield.
"But there are not many around and I do not like to go after players where it is an impossible mission".
"When I joined United a year ago I thought immediately that we needed a Matic".
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"So when I got the call that Matic wants to play for me and wants to play for Manchester United - and that we could make it happen - I thought he's the flawless player for me".
"I was surprised to see him move to United and maybe there is more to this deal that we realise", stated the former England midfielder, who is moving into television punditry with BT Sport this season.
"He is good enough, he is at the club he wants to be at, he has got lots of people there who will support him, his friends are there, and he will do just fine".
He said: "I think he's one of these players where there are no question marks in front".
"He won't need time to adapt".
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"I have better conditions to deliver a better season than my first one".
"Conte is a fantastic coach too, because he won everything at Juventus and has already won the Premier League in his first year with Chelsea". He has put his trust in me and in my work, and I was very grateful to him.
"He is a fantastic signing".
After an impressive pre-season, United will now look to prepare for their Premier League opener against West Ham on Sunday.
Matic was an integral part of Mourinho's Chelsea side which won the Premier League in 2015 and the Portuguese admitted he initially felt as though he had "no chance" of being reunited with the Serb at Old Trafford.
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