Edouard Mendy has reportedly agreed a five-year contract with Chelsea ahead of a proposed move to Stamford Bridge during this summer's transfer window.
Rennes president Nicolas Holveck has confirmed that his club are in talks with the Blues over the 28-year-old, who still has three years left to run on his contract in France.
Holveck, though, was keen to stress that an agreement between all three parties had yet to be reached.
According to RMC Sport, Mendy has agreed personal terms on a five-year deal with Frank Lampard's side, who have been extremely active during the current transfer window.
However, the report claims that the Premier League giants are still €8m (£7.4m) short of Rennes's €28m (£25.9m) valuation.
Earlier this week, the French club's captain Damien Da Silva suggested that his teammate was closing in on a move to Chelsea.
The Blues broke the transfer record for a goalkeeper when they signed Kepa Arrizabalaga from Athletic Bilbao in 2018, but the Spain international has struggled to make his mark in London.