The Belgium international was cut loose from his contract at Milan by mutual consent in December, over 600 days since his last competitive appearance.
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Origi remains a free agent, with his last taste of first team football with Nottingham Forest, where he spent the previous season.
The centre-forward failed to score in the league across 22 appearances in all competitions under Steve Cooper, before starting eight times under Nuno Espirito Santo.
Last weekend, Origi was seen in the US at a basketball game, while he has also participated in Paris fashion week.