Galatasaray coach Fatih Terim was banned for nine matches on Thursday for criticising the referee during a league game against Mersin Idmanyurdu.
Turkey's Football Federation (TFF) said Terim was guilty of insulting the referee and "unsporting behaviour" during the game while his two assistants received one- and two-game suspensions.
The severe sanction means Terim will be barred from six games in the current season and three in the next.
Terim was banished to the stands with a number of his coaching staff during Saturday's game, which Galatasaray won 3-1.
The manager, visibly angry, at one point went on to the pitch, slammed the match ball on the ground to show his anger about a string of decisions.
Newspapers Hurriyet and Vatan, quoting the official match report, said Terim insulted the referee and a TFF representative.