Everton are set to see their resolve tested with an offer from Chelsea for Romelu Lukaku.
Lukaku left Stamford Bridge permanently in 2014 to join the Blues for a club-record fee of £28 million but could now be heading back to the capital.
Antonio Conte has turned his turned attention to a deal for Lukaku after failing in efforts to prise his former Juventus player Alvaro Morata from Real Madrid.
Chelsea are understood to be planning to offer a deal in the region of £50 million for Lukaku, who has made no secret of his desire to join a Champions League club.
But Everton are holding out for an increased fee of £65 million for the striker, who struck 25 goals last season.
Ronald Koeman has made no secret of his desire to retain the club’s best players in the face of interest from their Premier League and European peers.