Chelsea defender Gary Cahill has urged England's John Stones to leave Everton to make a move to Stamford Bridge.
According to reports, the Toffees have rejected a £20m offer for the player from the Premier League champions.
Cahill, 29, joined Chelsea from Bolton during the 2012 January transfer window and says the time is right for Stones to join the Blues.
"Are Chelsea a hard club to turn down? Yes, of course," Cahill is quoted as saying by The Guardian.
"In terms of ambition, if you're a young player in the game, have played in the Premier League like he did a lot last year, and a big club come calling, it's very difficult to turn down because you want to achieve the most you can in the short period you have in your career as a professional footballer.
"When a top club comes calling, who you know will be firing on all fronts with competitions and medals, that's ultimately what you want to be playing for. It's hard to turn down, of course.
"He will look at the club, look at the players, and look at being involved in a squad like ours.
"When Chelsea came calling for me, it was an opportunity, it was a chance and looking from the outset you may not be sure how it's going to go.
"But it's one you can't turn down; you have to grab it with both hands. Then you have to work as hard as you can to make it work."