Derby have given permission for Chelsea to speak to Frank Lampard about the vacant managerial position at Stamford Bridge, Nottingham Forest's arch rivals have announced.
Lampard, the Blues' record goalscorer, has been strongly linked with the job since Maurizio Sarri left the role this month.
A statement issued by Derby said: "Derby County Football Club can confirm that they have granted permission for Chelsea Football Club to speak to Frank Lampard about the vacant managerial position at Stamford Bridge.
"With pre-season fast approaching for both clubs it is hoped this will allow Chelsea to swiftly conclude their discussions.
"The club will make no further comment until it is appropriate to do so."
Lampard is the overwhelming favourite to take be the next Blues manager and it appears unlikely he will turn down the chance to return to Stamford Bridge.
