Wallin, 35, has a 28-3 record and is best known for pushing Tyson Fury in 2019, opening a deep cut that nearly changed the fight.
He lost to Anthony Joshua in December 2023 and to Derek Chisora in February 2025.
He has lost two of his last four fights since 2023 and has not shown the same form that he displayed in his competitive loss to Fury. That version of Wallin is a long way from the one that was beaten by Chisora in February 2025.
In that fight, Wallin did not maintain a steady work rate and struggled to have an impact with his punches. He has not been known as a heavy puncher, but his output in that bout was lower than in earlier fights.
Wallin returned with a win in his most recent outing, stopping Chris Thomas in the second round last November, but that result came against limited opposition and did little to change his position in the division.
Those results leave him outside the immediate title picture, making his signing more about adding experience than introducing a new contender at heavyweight.
Zuffa Boxing has continued to bring in recognizable names as it builds its presence in the sport, and Wallin fits that pattern. He has remained active, but his recent performances have not placed him among the leading fighters in the division.
Signing with Zuffa could place Wallin in a structure with controlled matchmaking, where the level of opposition differs from the top heavyweights he has recently faced.
The move gives Wallin a fresh platform at this stage of his career, while also giving Zuffa another heavyweight option as it continues to assemble its roster.
No opponent or fight date has been confirmed for his debut under the promotion.
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