Roberto Martinez admits he cannot guarantee that Everton will hang on to Leighton Baines and Marouane Fellaini this summer. Everton have rejected a £12million bid for England left-back Baines, while Arsenal are tracking Fellaini. Martinez says Everton have not received any new offers for either star, but admits he may be unable to stop them going if they want to leave Goodison . "You should never ask a manager that!" said the Blues boss. "The modern game does not allow a manager to have that control.