Attacker has been with the Blues since 2011.
Mega-rich Russian outfit Zenit St Petersburg and Tottenham Hotspur are set to go head to head this summer in the battle to sign in-demand Chelsea front man Romelu Lukaku, according to reports in the Daily Express.
The giant Belgium international has just completed a season-long loan spell at Everton, where Lukaka proved himself to be a huge success by finding the back of the net on 15 occasions in his 31 Premier League outings on Merseyside, as well as also creating eight goals for Toffees team-mates too.
However, with Lukaku having since returned to Stamford Bridge following the completion of his short-term switch to Everton, there is now a raft of speculation as to where the 21-year-old will be plying his trade next season, with now both Zenit and Spurs said to be lining up £20m bids in order to land the player this summer.
And with his employers in west London said to be keen to make a profit on the initial £17m transfer fee which they paid Anderlecht to sign Lukaku in August 2011, it seems that the attacker could now be on his way out of the Bridge.