The complex deal which took Romelu Lukaku to Everton could reportedly help Chelsea re-sign the striker at a reduced rate.
Lukaku joined Everton in a deal worth around £28million in July 2014 following a successful loan stint at Goodison Park.
He had grown tired of a lack of first-team opportunities at Stamford Bridge despite being hailed as the next Didier Drogba after his capture from Antwerp.
The Belgian only made 15 appearances for Chelsea and former manager Jose Mourinho decided to call time on his Blues career after receiving the offer from the Toffees.
It was a move which now appears to have been a mistake as Lukaku, still just 22, has become the first Everton striker to hit 25 goals in a season since Gary Lineker.
He said during the recent international break that he wants to play in the Champions League next season, something Chelsea will not be able to offer him.
Romelu Lukaku's 2015-16 campaign in pictures:
But his father, Roger, revealed that there is interest from Man United, Bayern Munich, Atletico Madrid, Bayern Munich, Juventus and the Blues ahead of this summer.
Chelsea are hoping to persuade Lukaku that waiting one season longer for the chance to play in Europe and the chance for domestic success can entice him back to London.
Sources in Belgium say Everton will hold out for £65million for a player they see as one of the most promising prospects in world football.
It is a steep price but Blues owner Roman Abramovich is ready to bankroll a spending spree for incoming manager Antonio Conte when the transfer window re-opens.
And Chelsea hold an ace in the pack as the Daily Mail claims the deal that the club agreed with the Toffees two years ago includes several performance-related bonuses.
Everton are still in contention to win the FA Cup and lifting that trophy would be just one of a number of bonuses Lukaku could activate.
Chelsea could use any bonus money owed to them by the Toffees to help negotiate a reduced asking price for the powerful Premier League goalscorer.
Conte will be looking for more firepower in the summer with Radamel Falcao, Alexandre Pato and Loic Remy all expected to leave west London.
Atletico Madrid are also trying to lure Diego Costa back to the Vicente Calderon, however newly-appointed Conte wants to build a team around the Spanish international.
He has instructed Blues chiefs to reject offers for the fiery forward.
