Roberto Martinez has insisted that he is not worried about Romelu Lukaku's future at Everton following comments made by the striker's agent earlier this week.

Mino Raiola, who became Lukaku's agent after his move to Goodison Park last summer, said that the Belgian would not have signed for the Toffees if he had been representing him earlier.

"From my view, Romelu is one of the most exciting signings we've ever made and that shows the commitment and investment in the club, he's an incredible talent, he's 21 and has a long-term contract so for me there is no issue," FourFourTwo quotes Everton manager Martinez as saying.

"He [Raiola] is an agent who's just had a short period of time with his new client, and for whatever reason has made those comments. I've spoken with Rom, as I do all the players in those situations, about him deciding to change his agent, and that's his decision and he has every right to do that.

"He's a very important player for us, and we showed an incredible respect and integrity when we signed him for him and his career, and he showed the same to us."

Lukaku has scored 18 goals in all competitions for Everton so far this season.