Ousmane Dembele and Kalidou Koulibaly share the transfer spotlight with Kalvin Philips.
Barcelona winger Dembele is reportedly keen to join Chelsea, having also been linked with Manchester United and Arsenal over the past 12 months.
But the France star will be seeking a more regular start at Stamford Bridge.
He played the full 90 minutes for Barca just nine times last season.
It comes as Blues striker Romelu Lukaku nears an Inter Milan return.
Napoli lynchpin Koulibaly is another major Chelsea target who has also been on the Old Trafford radar.
But Italian club boss Luciano Spalletti has reportedly threatened to resign if the Senegalese centre-back leaves this summer.
Meanwhile, Wolves want £45million for French left-back Ryan Ait-Nuri – in the eyes of Manchester City and Chelsea.
But the same two clubs are considering an alternative – in Brighton’s Mark Cucurella.
Manchester United are said to have roped in Borussia Dortmund, Newcastle and West Ham to race Germany defender David Raum from Hoffenheim.
And Tottenham will have to pay Bayer Leverkusen center at least £34m to bring back Piero Hincapie.
Finally, Prem champs City Colul struck a deal this month for Leeds England midfielder Phillips.