The 36-year-old Portugal star is back for his second spell at Old Trafford and his former team-mate believes he can make the difference
Former Manchester United star Wayne Rooney has backed the club to battle for the Premier League crown with Cristiano Ronaldo back in the squad.
Ronaldo and Rooney starred together at Old Trafford, winning three consecutive titles between 2006 and the Portuguese's exit in 2009 and also lifting the Champions League in 2007-08.
And with the striker now gearing up for his second spell at the club, his ex-colleague has no doubt that he will prove pivotal to their efforts.