Chelsea would have to pay Derby around £4m in compensation if they appoint club legend Frank Lampard as their new manager.
With current boss Maurizio Sarri set to be confirmed as Max Allegri’s replacement at Juventus, Lampard is the overwhelming favourite to take over.
However, BBC Sport understands Chelsea are yet to make contact with the Rams.
Lampard won 11 major honours in his 13 years as a player at Stamford Bridge.
A deal between the Blues and Serie A champions Juventus was agreed in principle on Thursday, with the Italian club expected to have to pay in excess of £5million in compensation to secure Sarri.