Eastbourne United manager Arron Hopkinson resigned from his post at the Oval last (Tuesday) night.
Hopkinson resigned with immediate effect following United's 1-0 defeat at local rivals Langney Wanderers in the Premier Division on Tuesday night.
Assistant manager Matt Crabb will take temporary charge while the search for a replacement takes place.
Hopkinson was hired on December 17 2018 and engineered the great escape for Eastbourne United. The Oval outfit were 14 points adrift at the bottom-of-the table with just a solitary point before his appointment. But a superb run of form saw United accrue 27 points to finish third-from-bottom and survive on goal difference.
In a statement posted on Hopkinson's Twitter account he said: "Tonight (Tuesday) I decided to resign as manager of Eastbourne United.
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"I want to thank everyone at the club for giving me the opportunity to take my first job in management & for all the support throughout my time in charge.
"It has been a great experience for me to learn that side of the game whilst coming back from a lengthy injury.
"After putting together one of the strongest squads in the league this year I haven't been able to get the best out of the players.
"Alongside that my hunger to get back playing & being able to fully focus on playing it was only right for me to step aside.
"Ultimately my time in charge was a success we pulled off a miracle last year staying up after being 14 points adrift & I leave the club in a better position than where I found it.
"Thank you to everyone at EUAFC."