Arsenal legend Arsene Wenger believes Cristiano Ronaldo's arrival at Manchester United has created problems for boss Ole Gunnar Solskjaer.

Despite the fanfare around Ronaldo's arrival, and the goals he has scored, the Portuguese has seemed to cause the team's results to decline from last season.

United's latest disappointment was a 5-0 thrashing against Liverpool in the Premier League at the weekend.

"I wouldn't say it was a mistake but certainly some emotional impact was in there because he has been a fantastic player," said Wenger.

"No, I believe Ronaldo can still score you the goals you need. Can he repeat every three games, very high intensity games? That's certainly less the case today but let's not forget he was the hero three days ago.

"When you buy a player like that, the secret is the balance of the team. To play Ronaldo, he can win you games, but you need to create the balance around him."