"The time is now right for me to make a change and to return to English football," he has said.
"I spoke to Bryan Robson and was impressed with his plans for next season.
"Obviously he wants Premiership football back at the Hawthorns as soon as possible and that leaves me with another big challenge on my hands.
"I feel fit and healthy and cannot wait for the new season to start now. I am looking forward to a new adventure."