Two years later , Olympiacos entered the 1974 -- 75 European Cup .
They were drawn to face Kenny Dalglish 's Celtic , one of the strongest teams in European football at that time and semi-finalists of the previous season .
Two years later , Olympiacos entered the 1974 -- 75 European Cup and they were drawn to face Kenny Dalglish 's Celtic , one of the strongest teams in European football at that time and semi-finalists of the previous season .