Peterborough have announced the departure of manager Dave Robertson with immediate effect.
Robertson was dismissed in the wake of Saturday’s 2-1 defeat at Southend which left them 20th in League One.
In a statement Posh chairman Darragh MacAnthony said: “I would personally like to thank David for stepping in last season when the club was at a low point after the previous manager’s departure.
“He steadied the ship, put a smile on everyone’s faces again and worked tirelessly each day to improve the club’s fortunes on the pitch.
“Unfortunately after yesterday’s result and the manner of defeat, I felt it was time to take action and make a change as it had become plain to see our young squad was under-performing and playing nowhere near their potential.
“Make no mistake, our players must also shoulder responsibility for this awful start to the season which has now led to a great person losing their job.”
Robertson had replaced former boss Darren Ferguson in February, initially in a caretaker capacity, before being given the job on a full-time basis in May.