Jack Ross was sacked as head coach of Dundee United after Celtic’s 9-0 thrashing on Sunday – only his seventh game in charge.
The record home defeat for United was their fifth consecutive defeat, a streak that includes a 7-0 Europa Conference qualifier defeat at AZ Alkmaar.
Ross is two points off the bottom of the Scottish Premiership after just 10 weeks at United.
United confirmed he has been “relieved of his duties with immediate effect”.
Liam Fox is in charge for the time being, with Tannadice side visiting Livingston for a League Cup round of 16 on Wednesday and the club say they will have no further comment at this time.
Former St Mirren, Sunderland and Hibernian manager Ross, 46, was named in June to succeed Tam Courts, who guided United to fourth last season and secured European football for the first time in a decade before he moved to Budapest Honved.
United’s only league point from five games this season came at Kilmarnock on opening day. And Ross’ exit after humiliating defeat by Celtic leaves the club in search of a fifth manager in four years under American owner Mark Ogren.
After that defeat, Ross insisted he was determined to keep fighting and “make things right” – but United have now taken decisive action.
How could it go so wrong so quickly?
Ross’ fall at United was devastatingly quick after the first promising signs.
Saving only a debut win as Kilmarnock equalized in added time, then United celebrated an impressive win at a packed and noisy Tannadice when AZ were defeated 1-0 in the first leg of the Europa Conference qualifier.
However, this optimism soon waned along with the players’ confidence. After resting their players in the 1-0 defeat by Livingston, United traveled to Alkmaar with fresh legs and high hopes – only to be quashed 7-0, the biggest European defeat by a Scottish side.
The aftermath seemed to take a heavy toll as United returned to domestic action, being solidly beaten by St Mirren and Hearts ahead of the Celtic punch. United have conceded 24 goals and scored just one in their five-game losing streak.
United’s spending this summer has been the envy of some Premiership clubs. Ross was backed on the transfer market to bring in eight signings, including newcomers Steven Fletcher, Aziz Behich and Dylan Levitt, but the newly formed squad failed to deliver and the head coach paid the ultimate price.