Rangnick, in charge of United for the first time, used a 4-2-2-2 formation with Jadon Sancho and Bruno Fernandes playing as number 10's behind a strike pairing of Cristiano Ronaldo and Marcus Rashford.
And Rangnick was delighted with how Fernandes and Sancho performed in the 1-0 victory.
"For me it seemed logical to not make many changes after the win against Arsenal," Rangnick told reporters.
"The question was how do we get possession of the ball?
"We had enough space with Jadon [Sancho] and Bruno [Fernandes] in those number ten positions for our fullbacks to play forwards and ask for the ball on the wings. That was the reason I decided to play a 4-2-2-2.
"The most demanding positions in that formation are the tens and I think Bruno and Jadon did well in those positions. Defensively they both did well.
"Obviously it was about keeping them away from our goal, keeping them consistently under pressure and chasing balls and winning balls. We decided to go for a slightly different formation but only slightly different.
"We played with two strikers, Marcus and Cristiano up front with Jadon and Bruno on the 10 position and for the rest of the team it was the same position as usual. I just thought it might be better to have control in the centre of the pitch with Cristiano having a partner up front and I think it worked out well."
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