Adam Hinshelwood has left Albion’s youth set-up to take over as boss of Ryman League outfit Hastings United.
He will be replaced as under-18s assistant coach by Mark Beard, who has been promoted from the Seagulls’ academy staff to assist Ian Buckman.
The move means a return to non-league management for ex-defender Hinshelwood, was previously in charge of Worthing.
Albion academy manager John Morling said: "We are very sorry to lose Adam as he is an excellent young coach but we understand this is a great opportunity for him.
"He wants to be a manager and has been a No.1 previously with Worthing and Selsey, and at Hastings he will have the chance to further develop his career.
"The job will also allow him more time with his young family and, for footballing and family reasons, we understand Adam's motivation for wanting to take the job.
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“He has been a pleasure to work alongside and we wish him well in his new role.”
Morling believes Beard deserves his chance to step up.
He added: “Mark is another superb young coach who has demonstrated great ability during his time here and I believe he will provide a seamless continuity when stepping up to assist Ian."