Wigan Athletic boss Roberto Martinez finds it impossible to split Real Madrid ace Cristiano Ronaldo and Barcelona star Lionel Messi.

Indeed, the Spaniard says it's "unfair".

"It is very unfair to have to choose between Cristiano Ronaldo and Messi. It's like asking a child if they prefer Mum or Dad. Each player is different," he said.

"What Cristiano did in the Premier League with Manchester United was at the highest level and then to repeat this with Real Madrid shows a player who has a spectacular level.

"And Lionel Messi is a reference, is a form of gambling, is more than a player."