Danny Wilson has decided to leave Sheffield United with immediate effect with only five games remaining in League One this season.
Assistant manager Frank Barlow has also left the club, with first team coach Chris Morgan taking temporary charge of first-team procedures until the end of the season - starting with Saturday's game against fellow promotion chasers Swindon Town.
Sheffield United currently sit in fifth position in the League One table, and are well in the hunt for a promotion place, but manager Wilson has decided that he is not the man to try and lead The Blades back to the Championship.
Club owner Kevin McCabe released a statement on the official Sheffield United website: "We must thank Danny and frank for all of their endeavours and hard work over the past two seasons."
McCabe continued:" We now have a mini season for this club to achieve success and we will all back Chris in this mission."
Sheffield United lost 2-0 at home against Crawley Town on Tuesday and have won only once in their last six attempts.
Last season Sheffield United made the League One play-off final, but lost on penalties to Simon Grayson's Huddersfield Town.
Some of the favourites to take the reigns at Brammall lane include ex Leeds manager Neil Warnock, former Ipswich manager Paul Jewell and ex Oldham manager Paul Dickov.
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