The 31-year-old Brazilian centre-back only joined Lyon last summer for a fee of £6million but the French outfit want more than £20m to sell the player to West Ham.
Frank Lampard's Derby started their pre-season with a 4-1 victory over Notts County on Saturday.
West Ham got their first pre-season win as they beat Wycombe Wanderers 1-0 on Saturday thanks to a first-half goal from Marko Arnautovic. Andriy Yarmolenko also made his debut for the Irons.
• Clubs reportedly agree £14.1m fee for Dutch international• West Ham sign £3.5m Paraguay defender Fabian BalbuenaManchester United’s Daley Blind is set for a return to Ajax after the two clubs report...
Lazio midfielder Felipe Anderson has passed his medical ahead of his move to West Ham, according to Sky sources.
Paraguayan centre back Balbuena is West Ham's seventh summer signing after Issa Diop, Lukasz Fabianski, Ryan Fredericks, Sebastian Nebyl, Jack Wilshere and Andriy Yarmolenko.
West Ham have signed defender Fabian Balbuena from Brazilian side Corinthians on a three-year deal.
Manchester United are interested in breakout World Cup star Harry Maguire, although Leicester are planning to up his wages considerably in order to ward off a bid from the Old Trafford side.
While the nation was in the grip of World Cup fever , the Premier League’s summer transfer window opened. Here, Sportsmail highlights the eye-catching deals that were plotted while you were distracted...
Once Xherdan Shaqiri's deal to Liverpool is finalised, Sky Sports News understands it could trigger moves for Matt Ritchie, Andros Townsend and Michail Antonio.