Frank Lampard has been excused from reporting back for pre-season training with Derby as he continues discussions about becoming Chelsea manager.
Rams boss Lampard was last week given permission to speak to the Premier League club about succeeding Maurizio Sarri at Stamford Bridge.
Nottingham Forest's arch-rivals are said to be searching for a new manager on the assumption the 41-year-old will leave Pride Park.
"Derby County Football Club has excused Frank Lampard from reporting back for pre-season training on Monday and Tuesday to allow his discussions regarding a potential move to Chelsea to be concluded as soon as possible," read a statement on the club's official website.
"The first few days of pre-season training will be focused on fitness training and will continue as planned under the guidance of the fitness, medical, conditioning and sports science teams at the club's training centre.
"On the assumption that Frank will reach an agreement with Chelsea to become their new manager, the club shall step up its efforts to find a replacement manager."
