Bristol City's head of academy coaching Willie McStay has left Ashton Gate after 12 months in the job.
A club statement on Wednesday morning confirmed that head coach Sean O'Driscoll is now on the hunt for a new under-21 manager as they look for a fresh face to lead the development squad.
"I have really enjoyed my time at Bristol City Football Club," McStay told the club's official website.
"I have worked with a lot of great people and I'm also delighted with the progress made at the academy in terms of achieving our objective to attain EPPP Category Two status and improving the quality of the emerging talent at the club."
Managing director Jon Lansdown added: "Although Willie has only been with us for a relatively short period of time, that period has been one of the most important 12 months in the academy's history."
Strength and conditioning coach Alan Hughes has also departed his post.
The Gunners captain started the season as Arsene Wenger's first-choice centre-back but ended it watching the late climb to Champions League qualification from the bench.
Vermaelen's time at the Emirates Stadium has been disrupted by injury, but the 27-year-old Belgian denies he could be on the move in the transfer window.
"I'm happy at Arsenal. I didn't play much and that was frustrating, but things can turn around quickly," he told Ad.nl.
"I was on the bench, but I could just as quickly be playing again. I'm working hard to make that happen.
"These are things that happen in professional football. Arsenal are a great club where there is a lot of competition."
