Edouard Mendy has agreed terms with Chelsea and put pen to paper on a five-year deal, however, Rennes are looking to land one of Chelsea's first-team squad as part of the transfer deal.
According to Telefoot, the Ligue 1 side want Fikayo Tomori as a makeweight as part of Mendy's imminent exit.
However, it is unclear if the French outfit want Tomori on a permanent deal or just on a season-long loan.
French outlet L'Equipe claim Rennes had also demanded a €40m (£37m) fee for Mendy along with the option of signing Olivier Giroud.
Giroud is facing an uncertain future at the club due to the arrival of Timo Werner.
Pressed on a deal for Mendy this week, Lampard was unwilling to comment on any transfer information.
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“Not at the moment, not at the moment, no,” Lampard told Sky Sports on Monday when asked about any new arrivals.
This article was most recently revised and updated 4 years ago