Graeme Souness says Manchester United are title contenders after their signing of Juventus striker Cristiano Ronaldo.
Ronaldo passed a United medical on Sunday in Lisbon.
"I see him making the difference for them," Souness, Liverpool's former European Cup-winning captain, told Sky Sports ahead of United's win at Wolves.
"I think there's two, three or four players in Man United's dressing room that need him.
"Only him or (Lionel) Messi coming into the dressing room would make them up their game.
"Some players in that dressing room feel they've arrived, they're the real deal and no-one can tell them anything. But they will improve with Ronaldo there.
"You've got no chance unless you sign senior pros and Man United have just signed the ultimate. Training will be different and players' attitude will be different.
"I see United challenging for the championship with him in the team because they had 11 draws last season. They won't have them now because he's on another planet."
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