Roberto Martinez can 'guarantee' that left-back Leighton Baines will not be leaving Everton during the January transfer window.
Baines, who has missed Everton's last six games due to a toe injury, was the subject of several failed bids by Manchester United during the summer.
Speculation has suggested that former Everton boss David Moyes will make a fresh attempt to take the 29-year-old to Old Trafford when the window reopens.
However, Martinez has no intention of letting Baines leave Goodison Park and insists the England international is 'vital' for the second half of the season.
"In football you don't work long term, you go window to window and I can guarantee that Leighton will be here at the end of the season," said Martinez. "That is 100 per cent.
"That is how you work from window to window - to have a stronger squad than previously.
"Leighton is vital for us in the second half of the season. Bryan Oviedo has been terrific, but we need Leighton and Bryan fit for us, if we ...