Chelsea are interested in signing Lille goalkeeper Mike Maignan.
The 25-year-old is seen as a credible candidate to challenge Kepa Arrizabalaga for the number one position at Stamford Bridge.
However, Chelsea are yet to make an official bid for the player.
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Maignan was an ever-present for Ligue 1 club Lille last season and would cost around €30m (£27m).
He has played for France at every international level from U16 to U21 and has also been called into the senior squad.
Chelsea signed Spain international Kepa from Athletic Bilbao in the summer of 2018, parting with a world-record fee for a goalkeeper.
But Kepa's performances have come in for criticism and he was dropped in favour of the veteran Willy Caballero at times last season.
Chelsea close to agreeing Havertz, Chilwell and Thiago Silva deals
Havertz has received interest from some of the biggest clubs in Europe but is now set to move to Stamford Bridge, with Chelsea close to concluding a deal with Leverkusen that could be worth up to £90m.
The Blues are also likely to add Chilwell to their ranks, with talks between them and Leicester continuing on Monday.
The England international is understood to be keen on the move and a source has told Sky Sports News that the deal is "almost there".
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The summer transfer window will run for 10 weeks from July 27 and close at 11pm on October 5.
A domestic-only window for trades between the Premier League and EFL then runs from October 5 and closes on Friday, October 16 at 5pm. Follow all the news and analysis on Sky Sports News and across Sky Sports' digital platforms, including with our dedicated Transfer Centre blog.