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The 32-year-old, who called it quits in July after a 16-year career , is now seeking to rekindle his professional career.
He is open to playing at National League South level or above, or even abroad.
Harriott, who made nearly 100 appearances for Colchester, wrote on social media: "Coming out of retirement and looking for a new challenge at National League South level or above. Also open to opportunities abroad.
Flashback - Callum Harriott celebrates a goal with George Moncur, in his Colchester United days (Image: Steve Brading)
"Winger / No.10 with Championship, League One and international experience. Hungry to get back playing and make an impact. Retweet & share pls."
Coming out of retirement and looking for a new challenge at National League South level or above. Also open to opportunities abroad. ⚽️ Winger / No.10 with Championship, League One and international experience. Hungry to get back playing and make an impact. Retweet & share pls https://t.co/xwUXvQV8vl
— Callum Harriott (@Ckharriott) October 31, 2026
The Guyana international, who scored nine times in the 2020-21 season, finished last season at Braintree Town .
Harriott also played for Charlton Athletic, Reading, and Gillingham during his professional career.