Arsenal and Tottenham are among a number of clubs tracking Florian Lejeune, the Daily Mirror say.
The Eibar defender, who previously had a spell at Manchester City, reportedly has a release clause of £8.7m in his contract.
The Mirror reckon Arsenal boss Arsene Wenger has had Lejeune, 25, scouted and has received favourable reports about him.
And with Spurs tipped to sign a centre-back this summer, they too are said to be interested in the Frenchman.
The Mirror also claim Chelsea will have to pay Thibaut Courtois more than £200,000 a week in order to prevent him joining Real Madrid.
The Blues goalkeeper has repeatedly been linked with a move to Spain and is said to be Real’s top transfer target for this summer.
The Mirror suggest that Courtois knows he is in demand and that Chelsea face a battle to persuade him to commit his long-term future to the club by signing a new contract at Stamford Bridge.
The newspaper also predicts that Bournemouth will make another attempt to sign Asmir Begovic from the Blues at the end of the season.
Back-up keeper Begovic was prevented from leaving to join the Cherries during the January transfer window because Chelsea were unable to bring in a replacement for him before the deadline.