Mourinho is delighted with what he's seen from the Swede.
The manager remarked after victory over Real Salt Lake: "It's the difference between playing with three in the back or four in the back. When you play with three, you project with the wingers and you need the central defenders to drive and to come with the ball.
"When you play with four in the back, if you project with the right-back and the left-back, you only have two defenders and they have to share [the workload] and keep their position more.
"His quality of passing is always very good, he's technically very good but obviously with three in the back, he has more freedom to attack spaces in midfield."