Everton believe they will lose Romelu Lukaku to Premier League rivals Manchester United this summer — even if Louis van Gaal is replaced at the end of the season as is widely expected.
Everton boss Roberto Martinez is however desperate for his star striker to stay at Goodison Park beyond this summer.
And while the Tofees insist Lukaku is not for sale, The Daily Mirror reports the club are privately worried they will be unable to hold on to the 22-year-old in the transfer window.
Everton believe Jose Mourinho — likely to replace Van Gaal at United — holds sway with the Belgium star, despite selling Lukaku during his reign as Chelsea boss.
United could miss out on Champions League football next season, with neighbours City currently in fourth place and West Ham fifth with better goal difference.
Mourinho was criticised for loaning out Lukaku twice before letting him leave in a permanent deal to Everton in 2014.
But the striker, who has scored 18 league goals this term, has admitted he is open to a reunion with his former manager.
United face competition for the Belgian hotshot, with Juventus reportedly keen on signing him, especially if they lose Paul Pogba as that will make the resources available to go after the big Belgian striker.
Everton travel to Old Trafford to take on the Red Devils on Sunday.