Chelsea have been given permission to speak to Derby boss Frank Lampard about their vacant manager's job.
Lampard, 41, spent 13 years as a Chelsea player and would replace Maurizio Sarri, who has joined Juventus after one season at Stamford Bridge.
The Blues would have to pay the Rams about £4m if they appoint Lampard.
"With pre-season fast approaching for both clubs it is hoped this will allow Chelsea to swiftly conclude their discussions," a Derby statement read.
"The club will make no further comment until it is appropriate to do so."
Lampard who joined Chelsea from boyhood club West Ham for a fee of £11m in 2001 embarked on his first campaign as a manager last season, leading the Rams to the Championship play-off final where they lost to Aston Villa.
He made 648 Chelsea appearances, winning 11 major trophies.
If he does take over, he will inherit a transfer embargo after Chelsea were given a two-window transfer ban by world governing body Fifa - a decision the club are appealing against at the Court of Arbitration for Sport.
He won a Champions League and a Europa League at the club, while also helping them to win three Premier League titles, four FA Cups and two League Cups.
Chelsea's title win in 2004-05 was their first in half a century and Lampard scored 13 league goals that season, included both in a 2-0 victory at Bolton that sealed the top-flight crown.
He scored 10 or more Premier League goals in 10 successive seasons for Chelsea and is the club's all-time record goalscorer with 211.
Lampard left Stamford Bridge in June 2014 and had a stint at Manchester City, where he scored six goals in 32 appearances.
He then joined New York City in Major League Soccer in the US, making his debut in August 2015, before ending his 21-year professional playing career in 2017.
Lampard won 106 England caps after making his international debut in 1999 and went on to score 29 goals for the Three Lions.
He appeared in three World Cups and one European Championships.