Manchester United legend Sir Bobby Charlton has no doubts Cristiano Ronaldo will have a big World Cup for Portugal.

Ronaldo goes to South Africa in good form after an outstanding first season with Real Madrid.

"Cristiano Ronaldo is one of those players who is almost impossible to stop and will be undoubtedly be one of the best in the World Cup," said Charlton.

"But I don't think Portugal have a great chance of winning it."