Donny van de Beek, who joined United from Ajax this summer for a fee of £40m, played the full match at Villa Park on Saturday.
Ole Gunnar Solskjaer praised Donny van de Beek's Manchester United debut, saying it the "biggest plus" to take from their friendly defeat against Aston Villa.
The 23-year-old, who joined United from Ajax this summer for a reported fee of £40million, played the full 90 minutes of the match on Saturday.
The Red Devils were without midfielders Paul Pogba, Bruno Fernandes, Fred, and Nemanja Matic.
However, Solskjaer says he was very happy with the Dutch midfielder's performance at Villa Park.
"Donny was maybe the biggest plus outfield," Solskjaer told MUTV. "He's such a finder of space and creates time for himself with his timing and movement. I was very happy with his performance."
Man United played the match without 16 first-team players but the Norwegian is confident his big-name players will be back for their Premier League opener against Crystal Palace on Saturday.
He added: "Yeah, of course, we expect more of them to be match fit because the international players who didn't travel today didn't have the minutes and we'll get a few more back.
"Well, I think in the first-half we played some good stuff, created chances and the most important thing is valuable minutes.
"This pre-season is such a strange and different one for us. We've had two weeks back and it's only one week until we start the league.
"Of course, [playing in the] Europa League will help us in that respect. Players who have played over the summer don't really need that much and some of the international games helped us, you could clearly see that some of them needed minutes."