Alessandro Schoenmaker has been appointed head of sports science at Derby County.
The Dutchman is reunited with Rams head coach Steve McClaren whom he has previously worked with at FC Twente, Wolfsburg and Nottingham Forest.
Schoenmaker will help to oversee the fitness, strength and conditioning of the squad, alongside strength and conditioning coach Steve Haines.
"We're very pleased to have Alessandro on board with us," McClaren told Derby's official website.
"I've worked with him in the past and he is very good at what he does.
"The sports science side of the game is hugely important and Alessandro will be working a lot on individual programmes for players, alongside Steve Haines, whom he already has a good working relationship with."
Schoenmaker added: "Hopefully, we can follow up what was achieved last season.
"I want to come here and help develop the department by passing on my experience and background."