Victor Lindelof admits that he is not accustomed to playing in a system with three central defenders.
Lindelof made his first appearance in a United shirt in the 5-2 friendly victory over LA Galaxy on Saturday, playing the second half alongside Eric Bailly and Axel Tuanzebe in defence.
The Swede joined for £30.75million this summer, and is expected to slot straight into the first team.
He was “very happy” with his first performance, but admits he might need extra work in a new system.
“I am not used to playing with three at the back, but it felt good in a way and I am very happy,” he said.
“I am very happy to have made my debut for this great club.
“My first week has been very good. All of the guys in the team have really helped me a lot
“It is the first game and I am really looking forward to playing more games.”
Mourinho has hinted that he could use the system next season.
“We have trained for five days and in these five days we trained for two days in the relation to this system [three at the back],” Mourinho said at the weekend.
“The improvements are in relation to four hours of work so I couldn’t expect much better, it’s something we have to keep working on in case during the season we decide to play three at the back.
“We did it twice against Rostov and maybe we want to do it more times.”