Former Nottingham Forest midfielder Pajtim Kasami has been linked with a return to Evangelos Marinakis' Olympiacos, after being sacked by FC Sion.
Dismissals also included former Arsenal players Alex Song and Johan Djourou.
The players are said to have refused to sign an agreement for a wage cut during the indefinite suspension of the Swiss top flight.
The Swiss league was stopped on March 1 after the government banned gatherings of more than 1,000 people.
Kasami spent a season on loan at the City Ground from Olympiacos, playing 25 league games for the Reds during the 2016-17 campaign.
Greek media outlet SDNA report he would be "a big favourite" to return to Olympiacos if either Mady Camara or Guilherme leave the club.
