Manchester United striker Alexis Sanchez is happy for Romelu Lukaku over his World Cup form with Belgium.

Sanchez may not be in Russia due to Chile's failure to qualify, but he has been keeping track of events at the World Cup and has been hugely impressed by Lukaku.

He said: "Lukaku is fine, on fire. He has four goals.

"I hope he is the top goalscorer of the World Cup."

Lukaku's four goals mean that he is level in second place for the golden boot along with Portugal star Cristiano Ronaldo.