Hull City boss Leonid Slutsky has left the club by "mutual consent" after the Championship side went seven games without a win.
The former CSKA Moscow manager became the first Russian to manage an English side when he took over the relegated Premier League club in the summer.
However, the 46-year-old won only four of his 20 league games in charge and questioned his players' mentality after losing 4-1 at Sheffield United.
Hull are 20th in the Championship.
Slutsky arrived at the East Yorkshire club with considerable pedigree, having won three Russian titles with CSKA Moscow and managed Russia at Euro 2016.
Under Slutsky's leadership the Tigers scored 34 goals in the Championship, but conceded 37 - the third-highest total in the division.
His last game was a 2-2 draw at Sheffield Wednesday on Saturday.
Slutsky's departure means Hull are looking for their fourth manager since Steve Bruce resigned in July 2016.
After the 3-1 defeat by Middlesbrough on 31 October, Slutsky admitted he would have understood being sacked.
Hull vice-chairman Ehab Allam said: "Leonid has worked tirelessly in his role and has acted with complete honour and been a pleasure to work with.
"Unfortunately results have not improved as both parties would have hoped and therefore it was agreed for the relationship to come to an end."
Slutsky said: "I am very proud to have been through this experience, it was challenging but a very exciting time for me."
Head of club strategy Oleg Yarovinsky, who had worked with Slutsky as Sporting Director of CSKA Moscow, has also left his role at the KCOM Stadium.