A 2-0 win over Panthrakikos was enough for Michel's side to seal their 16th domestic crown in 18 seasons with five rounds of fixtures still to play
A strike from Nelson Valdez and a penalty from David Fuster was enough to seal a comfortable result for Michel's men against the 10-man visitors, giving them an unassailable 18-point lead over Atromitos with five rounds to play.
The initial title celebrations took place in front of an empty stadium, with Olympiakos forced to play behind closed doors as a result of recent supporter violence during an encounter with rivals Panathinaikos.
The triumph - Olympiakos' fourth in a row, and their 16th in 18 seasons - was secured despite Michel resting a handful of his biggest names in preparation for the Champions League last-16 second leg against Manchester United on Wednesday.
Τhrylos will take a 2-0 lead to Old Trafford as they bid to reach the quarter-finals for the first time since the 1998-99 season.