Union Berlin parted ways with coach Bo Svensson (45) and members of his staff, the Bundesliga club said on Friday, after the club's recent poor run of form.
Union have been winless for more than two months and, having lost five of their last seven Bundesliga games, are in 12th place on 17 points from 15 games.
"After a thorough analysis of the season so far, we are convinced that a significant change is necessary to reverse the trend," Managing Director Horst Heldt said in a club statement.
"We have therefore decided not to continue the cooperation with Bo Svensson, Babak Keyhanfar, Kristoffer Wichmann and Tijan Njie."
A decision on a new coaching team to take over from the 2nd of January will be made in the next few days, the statement added.
Union, who lost 4-1 at Werder Bremen last time out, next travel to lowly Heidenheim on the 11th of January.