The experienced stopper has endured a difficult campaign so far and he has been linked with sides back in America.
However, Martinez suggests that Everton have received no interest in the 36-year-old, and in any case he is not looking to move the stopper on.
"It's news to me. We've had no approach from MLS and Tim has still got another two years on his contract with us," the Spaniard said.”
Many Everton supporters have called for Howard to be dropped in recent weeks due to his poor form.
The former Manchester United man has been guilty of gifting opposition sides goals throughout the campaign and his form did not improve at the weekend.
Howard was partly at fault for one of Swansea’s goals in Everton’s 2-1 defeat against the Welsh side, after he gave away a penalty in the first half.
Joel Robles is Everton’s back-up stopper, but Martinez has only picked the Spaniard in cup competition so far and it seems Howard is still regarded as the first-choice stopper when fit and available.