Former West Brom assistant boss Frank Burrows has left the club after turning down a job under Bryan Robson.
Burrows helped Albion avoid the drop from Division One in 2000
Burrows was put in temporary charge after Gary Megson's exit but has now reached agreement over the remaining eight months of his contract.
Baggies chairman Jeremy Peace said: "Frank has decided to take a break and look for a new challenge elsewhere.
"We're sorry Frank has reached this decision but he has made his mind up and we won't stand in his way."
Peace added: "Frank has done a lot of hard work behind the scenes during the last four-and-half years which most people won't be aware of. He's been an unsung hero of this club's success."
Burrows, who has previously managed Portsmouth, Cardiff and Swansea, said: "I have enjoyed my four years and eight months at The Hawthorns and I hope the club goes on to bigger and better things."