The 20-year-old Romelu Lukaku enjoyed a breakthrough season at Everton, on loan from Chelsea, after being given a chance by Martinez to shine in a central striker’s role. Lukaku showed his potential after notching 15 league goals for the Toffees in just 31 appearances and helping them to their highest ever points tally in the Premier League.

Everton want to keep hold off Lukaku in the summer after his productive one-year loan at the club. However, his future is still uncertain with Jose Moruinho mum on his plans for the explosive but raw forward.

Chelsea spent £18 million for his services in the summer of 2011 and could look to receive £20 million if Mourinho decides to sell. Martinez was not worried about Chelsea’s steep asking price but instead focused on Lukaku’s potential.

According to the Liverpool Echo, he said, “I don’t think that’s my worry. The worry would be that if the deal was a cheap one, it would be because he has had a torrid time and hasn’t fulfilled his potential.”

“The reason Romelu came to Everton was for him to take a big role, take a lot of responsibility, to start playing 90 minutes and be a real brain in that forward line, and he has done that so we couldn’t be happier.”

He also revealed that he expects Lukaku’s future to be resolved only after the World Cup. He said, “We’ll see what’s the best thing for everyone. But everything will be in stages: how Chelsea are doing in their own squad and how that frees some players.”

“It’s going to take a bit of time and I don’t think Romelu’s situation is going to be resolved before the World Cup, in truth. I think it will be after the World Cup.”