Peter Nicholas has been appointed manager of Neath Athletic after the club parted company with Andy Dyer.
Nicholas, who won the Welsh Premier title as boss of Barry Town and Llanelli, has been part of Neath's coaching team for the past two seasons.
"Neath FC can today officially confirm that manager Andy Dyer has left the club," said a Neath statement.
"Also leaving the club with Andy, will be assistant manager, Ray Pennock and coach Simon Dyer.
"The club would like to place on record its thanks to Andy and his management team for the fantastic work they have done for the club down the years.
"An announcement on the management structure for the forthcoming season will follow in due course. In the meantime Peter Nicholas will assume control of all first team affairs with immediate effect."
Nicholas, who won 73 caps for Wales, guided Llanelli to their first Welsh Premier title in 2008 but was released a year later after the club finished as runners-up.
His first success as manager came in 2001 when he won the League of Wales title with Barry Town. The 51-year-old was appointed Swansea City assistant manager a few months later alongside Colin Addison, but the pair left the club six months later.
Nicholas then had two seasons with Newport County before joining Llanelli in 2005 as coach, working alongside director of football Lucas Cazorla Luque. He became boss when Spaniard Luque left in February 2006.
Dyer had been manager at Neath Athletic since the club was formed in 2005 following a merger between Skewen Athletic and Neath.
The Eagles are among the biggest spenders in the Welsh Premier, having managed to tempt former Swansea City striker Lee Trundle to join them last summer.