Cristiano Ronaldo will have his work cut out to impress Zlatan Ibrahimovic as he embarks on his second coming at Manchester United.Fans are hoping to see the five-time Ballon d'Or winner in action for Ole Gunnar Solskjaer's side against Newcastle on Saturday - 12 years after he last played for the club.Former United striker Ibrahimovic will also be a keen observer, after he admitted he will watch the 36-year-old wherever he plays.But Zlatan will be a tough critic, having previously claimed Wayne Rooney should have got the credit for Ronaldo's early success with the Premier League giants.During his first spell at Old Trafford, Ronaldo won three league titles, the Champions League and the Club World Cup as he began his journey to.
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