Sokratis Papastathopoulos has joined Olympiacos as a free agent after leaving Arsenal this month.
The Greece international last week had his Arsenal contract cancelled by mutual consent with six months left.
It was reported that Premier League champions Liverpool had shown an interest in signing Sokratis, but he has chosen to return to Greece to join Olympiacos.
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The 32-year-old, who joined Arsenal from Bundesliga club Borussia Dortmund in 2018, played 69 games in all competitions for the London side and helped them win the FA Cup last season.
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Olympiakos are top of the Greek Super league with 48 points from 18 games, 11 points clear of second-placed AEK Athens.
They face PSV Eindhoven in the Europa League last 32.
Additional reporting by Reuters
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