Belgium boss Roberto Martinez has warned Chelsea that Romelu Lukaku could cost triple the amount for which he was sold to Everton.
The 23-year-old never really got his chance during two seasons as a promising youngster at Stamford Bridge, and was eventually offloaded to the Toffees for a club record fee of £28 million.
Lukaku currently leads the Premier League scoring charts with 21 goals this season, and Martinez believes Everton will demand a tidy profit if the Belgian is sold back to the Blues.
"It’s difficult to say," Martinez answered when asked if his former club can keep hold of the player who he now coaches at international level.
"What’s important is that as a club, if you lose a player, you lose him on your own terms. Rom has doubled or trebled the initial fee that Everton paid for him."
The Blues only have themselves to blame for letting Lukaku leave in the first place, and Martinez insists that he always believed in his former player’s potential.
"In my eyes, potentially, he was worth more money," he added. "We knew he’d become the player he is now."