The player's agent, John Shittu, told the London newspaper that Mikel is eager to remain at Chelsea despite the interest from Napoli and Galatasaray.
Both clubs bid for the Blues midfielder earlier this summer, but Mikel remains keen to stay in west London.
"He loves this club, the manager knows him and likes him and he will not be going anywhere during this transfer window," Shittu told the Evening Standard.
"Some clubs came in and expressed their interest but that is where it stopped. They were never allowed to get to the point where we could even begin to start talking about valuation or negotiation.
"We cannot say what will happen in the future. This is football and anything is possible. But, for now, he is a Chelsea player and is happy to remain a Chelsea player for the rest of his career."
Mikel has barely featured for Chelsea this season. He spent the summer at the Confederations Cup with Nigeria, but his involvement in the Premier League so far amounts to one substitute appearance against Manchester United on Monday evening.
And when questioned about Mourinho's preference for playing Frank Lampard and Ramires ahead of Mikel, Shittu said: "He did not have a proper preseason because he got a couple of weeks extra off due to his Confederations Cup participation and then an injury so he is not fully match fit.
"When he starts playing is down to the manager but as soon as he gets his match fitness back, he will be in contention."
Chelsea look set to continue their summer spending with the recruitment of Anzhi striker Samuel Eto'o. The Cameroonian forward will join his former-Anzhi teammate Willian, who completed his switch earlier this week.