The region’s interim managing director, Jamie Muir, said: “The fact Matt has been approached by Wales is testament to the progress we have made as a club.
“We are confident with the staff that remain in place and are fully focused on kicking off the new season on Saturday night in positive fashion.”
Tandy became Wales head coach on 1 September and has already added Danny Wilson to his management team with responsibility for the line-out and contact areas.
Wales have four autumn internationals in November against Argentina, Japan, New Zealand and South Africa.
Tandy said: “Matt did a great job to get that result in Japan on a short turnaround after a long season. He is an excellent coach. His philosophy and approach is a great fit our playing group.”
Born in Gloucester, Sherratt cut his teeth at Gloucester and Cheltenham and spent four years at Worcester Warriors’ academy, before becoming an attack specialist for Bristol, Ospreys and Cardiff.
After another spell at Worcester, Sherratt returned to Cardiff for a second stint as backs and attack coach in 2021 and has become a hugely popular figure at the Arms Park having led the club to the URC play-offs in 2023-24 despite hugely difficult financial constraints.
“I am proud that we have been able to put the club back on solid foundations, have implemented a playing style that resonates with the history and city, and enjoyed so many memorable moments at the Arms Park,” added Sherratt.
