Briedis was originally mandated for challenge Bellew for the green and gold belt, although promoter Eddie Hearn successfully lobbied the World Boxing Council for a voluntary defence against BJ Flores.
That left Briedis and manager Al Siesta with a big decision to make, which lead to the big-punching Latvian accepting a fight on the Bellew v Flores undercard at the Echo Arena in Liverpool.
Former Team GB member Vallily was confirmed as the opponent to WBN earlier this week and Siesta says Bellew will be able to see first-hand what he could possibly come up against in the first part of 2017.
“I feel that Simon Vallily will be acting as a sort of spy for Bellew or even a guinea pig to see what it’s like to share the ring with Briedis,” Siesta exclusively told World Boxing News.
“I must admit his amateur pedigree is impressive and he obviously knows his way around the ring, so Mairis got quite inspired when I offered him to fight Simon.
“All he asked for is the bout to be no less than 10 rounds and Vallily’s team agreed to that with no hesitation.I’m personally really excited about the fight and I feel there’s a hidden intrigue to that.
“I’m personally really excited about the fight and I feel there’s a hidden intrigue to that.
“Let’s see what happens on the 15th, although there’s always a chance that BJ may bottle it at the last minute when he comes to see how crazy the Scouserland fans are for Bellew!”
“Then Tony will surely have to face Mairis but only time will tell,” he added.