Liverpool appointed Ryland Morgans as their new head of fitness and conditioning in October 2012.
The Welshman was previously at Swansea City, where he was the head of fitness and science.
Morgans has doubled as the head of fitness and science with the Wales national side under both Gary Speed and Chris Coleman.
He joined Swansea in August 2010, leaving Fulham to link up with his hometown team.
LFC head of performance Glen Driscoll said: "Ryland is excellent on the pitch and I think the players have immediately seen a massive difference in what he can give Liverpool and the levels he can take the club too.
"From a professional perspective, he's in line with the methodologies, he worked with Brendan for two years and that's important. I've built up a really good relationship with Ryland, so I'm excited to be working with him. He's really got an exceptional CV and experience in football. He is someone who can definitely improve us in this area and take us on.
"He'll be in charge of taking warm up and physical sessions and basically help run the science department, linking in with myself, the medical team and the manager. He'll ultimately provide a service which I think will be really beneficial for Liverpool."