Rafael van der Vaart admits he could never be friends with former Real Madrid teammate Cristiano Ronaldo.

Van der Vaart, formerly of Tottenham and Ajax, returned to Spain last season with Real Betis.

"I do not think we could be friends, because Cristiano is too boring!" he told NOS.

But the Dutchman added: "He is a great professional.

"He's the first to step onto the training field and the last to leave. That's why he has had such a great career."