Haj Safi signed a two year contract with Greek Super League side Panionios in June 2017 and teamed up with his fellow Masoud Shojaei.
The media reports suggest that Haji Safi will leave Panionios in January to join Olympiakos.
The 27-year-old international defender will reunite with his countryman Karim Ansarifard in the top-flight team if he leaves Panionios.
Haji Safi has represented Iran at the 2011 AFC Asian Cup, the 2014 FIFA World Cup and the 2015 AFC Asian Cup.