The character took to the stage tonight with their foot in a cast, which viewers think is a reference to his TV show The Last Leg – and the fact he wears a prosthetic leg.
But he dropped an even bigger clue when he mentioned working with a rhino in a sporting capacity – Alex famously signed up to play rugby for the Leeds Rhinos Foundation PDRL team.
Taking to Twitter to discuss it, one person wrote: “Big foot is it @TheLastLegAlex Brooker on
@MaskedSingerUK? #TheMaskedSinger.”
A second said: “Bigfoot is clearly Alex Brooker…linked to Leeds Rhinos too #TheMaskedSinger.”
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While a third added: “Bigfoot has gotta be Alex Brooker. His voice and the bandaged foot(maybe to help him get around the stage) is a big giveaway 😄 #TheMaskedSinger #MaskedSingerUK.”
And a fourth said: “With the rhino clue, Bigfoot is defo Alex Brooker! #TheMaskedSinger.”
Other suggestions for Bigfoot so far have include Hamza Yassin and Bear Grylls.
Alex was born with hand and arm deformities and now wears a prosthetic leg.
He also had a twisted right leg, which had to be amputated when he was a baby.