PSG ace Leo Messi admits he's followed Cristiano Ronaldo's move to Manchester United this season.

Messi has insisted that his long-term rival Cristiano Ronaldo has adapted impressively on his return to Manchester United, despite the club's recent dire form.

"United is a very strong team with great players. Cristiano already knew the club, but it's in another stage and now he has adapted in an impressive way," Messi told Marca.

"From the beginning he has scored goals as always and had no problems adapting.

"In the Premier League it is not as good as we all thought, but it is a very difficult and even competition in which things take a lot of turns.

"After December it changes a lot and anything can happen."