Sonny Bill Williams trained with Pete Taylor earlier this week as he continues preparations for his next fight.
The rugby great has been working with Andy Lee in recent months and was part of Joseph Parker's training camp for his December win over Derek Chisora.
Williams visited Taylor's Colosseum Gym, where he trained alongside Belfast fighter Tommy McCarthy.
Sharing photos on Instagram, Taylor wrote: "Great to have @sonnybillwilliams in for a few rounds with @tommymac90 - best wishes with your boxing career under the guidance of @bodypuncher."
The former All Blacks star, who is undefeated as a boxer, is set to face AFL legend Barry Hall in March.
Williams took a break from boxing in 2015 before winning the Rugby World Cup later that year.
He returned to the ring last June, beating Waikato Falefehi via unanimous decision.
Williams recently trained alongside world heavyweight champion Tyson Fury in England.
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