Blatt announced in August he had been diagnosed with MS, which attacks the central nervous system, a few months earlier. At the time, he said he was determined to continue working despite "not being as agile or active."
Blatt's departure was a "consensual termination of cooperation," Olympiakos said without providing further details. The announcement comes two days after Olympiakos lost 82-63 to French team ASVEL in its opening Euroleague game of the season.
Blatt was appointed coach of Cleveland in June 2014 and took the team to the NBA finals in his first season, losing to the Golden State Warriors. He was fired partway through the 2015-16 season, in which Cleveland won the NBA championship for the first time under coach Tyronn Lue. He has coached Olympiakos since June 2018.
More AP sports: https://apnews.com/apf-sports and https://twitter.com/AP_Sports