PAOK have signed Chupa Akpom for a second-time.
He has now left the Riverside for a return to Greece.
"The 25-year-old joined Boro from the Greek Super League club 12 months ago and made an immediate impact, scoring twice in his first two games. He has totaled five in 40 appearances since arriving on Teesside and has figured just once this season.
"Chuba is returning to the club where he enjoyed the most successful period of his career – netting 18 goals in 79 appearances and playing a central role in PAOK's first league title success for 34 years.
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