Slaven Bilic says he leaves with his "head held high" after being sacked as West Brom manager.
"I'm sorry I cannot say goodbye to you all properly at The Hawthorns," Bilic said.
West Brom are second bottom of the Premier League with seven points from 13 games.
Promoted from the Championship on the final day of last season, they have won only once in the league this season.
"I am incredibly proud that we secured automatic promotion from the Championship in our first season," Bilic said.
"It was a real shame to not have our loyal supporters there with us during that moment and upon our return to the Premier League.