Swindon manager Mark Cooper has left the club following Saturday's defeat at Millwall.
Cooper, who had been approached to join Sheffield Wednedsday's backroom staff in the summer, following Carlos Carvalhal's appointment as head coach steered Swindon to the Sky Bet League One play-offs last season, but a 2-0 loss at the New Den has left them without a league win in six matches and one point above the relegation zone.
The club has yet to make a statement but said on its official Twitter site: "Swindon Town Football Club have (on Saturday) evening parted company with manager, Mark Cooper.
"A full statement from the football club will be made on Monday."
Cooper, whose squad have been hit by injuries to key players this season, chose not to join the Owls in the summer and is understood to have also turned down Barnsley.
He has worked with a limited budget since being appointed as Kevin McDonald's successor at the County Ground in the summer of 2013 following a brief spell as assistant manager.
Cooper steered Swindon to fourth place in League One last season and after beating Sheffield United in the play-off semi-finals they lost out to Preston in the final.
But the sale of key players such as Ben Gladwin and Massimo Luongo in the summer and a spate of injuries have seen the Robins win only three of their 12 league games this season.