Sunderland will only consider offers of about £30m for goalkeeper Jordan Pickford, says boss David Moyes.
Pickford, 23, has impressed this season, despite the Black Cats' relegation from the Premier League, and won a first England call-up in October.
Everton are rumoured to be interested in Pickford and are prepared to offer £15m for the England Under-21 international.
"It would need to be a really, really big offer," said Moyes.
"I have said all through the season that sometimes on your journey, you may have to sell to improve.
I have heard some really derisory sort of figures getting mentioned,
and it wouldn't be any of those figures, I can tell you that."
When asked if Pickford's asking price would be in the region of £30m, Moyes replied: "Yes."
£30m transfer would make Pickford the second most expensive goalkeeper
of all time, after Gianluigi Buffon's £33m move from Parma to Juventus