The 22-year-old has been linked with a move to Chelsea in recent weeks.
The Belgium international joined Everton in a £12million deal from Standard Liege in September 2008 and has three years left on his contract with the club.
“I’m really happy at Everton. I have three years left on my contract and everything is going really well,” he told Sky Sports News.
“I’m just focused on doing my best for the club. Doing my job here and doing what I’m being paid to do. Whatever happens in the future? Well, all I’m concentrating on is the present and Everton.
“We made things really difficult for ourselves at the start of the season and now we’re out of both cup competitions, but we’re still in Europe.
“So the aim now is to get as far as we can and win as many games as we can between now and the end of the year.”
