Barcelona defender Gerard Pique says there's no comparison between Lionel Messi and Real Madrid star Cristiano Ronaldo. Pique played with Ronaldo at Manchester United, but insists there's a gulf in class between the pair.

"Right now, there is so much difference, and [Messi] has shown each day that there does not have to be any debate. Sometimes the debates are so absurd that it seems impossible that they even arise," said Pique.