Robbie Keane has dismissed talk of Manchester United signing Cristiano Ronaldo being past his best.

Ronaldo departed Old Trafford for Real Madrid in 2009 at 24 years of age and went on to win several World Player of the Year awards amongst Champions League and Spanish title wins.

Asked about claims he was past his best, Keane said: “His mentality is completely different and the reason why he's still playing at 36 years of age, the reason why he's in that unbelievable shape.

“Unfortunately he scored two goals in the last few minutes against Ireland, which was gutting for me, but that just goes to show how good he is and how important he is to Portugal and obviously now to Man Utd.

"I've got no doubt he could finish top goalscorer in the Premier League."