Jim King, who is the CEO of European Festivals at AEG Presents, suggests the two gigs could turn out to be the "biggest shows of the summer".
He says: "The demand to see Zach Bryan has been incredible, with his fans coming from all over the UK to see these exclusive performances. It's shaping up to be the biggest shows of the summer."
The former US Navy officer independently released his debut albums DeAnn (2019) and Elisabeth (2020) and built up a fan base through YouTube.
In 2021 he was signed by and then left the Navy to pursue a full-time career in the music industry.
The 28-year-old Oklahoma born star, who's been likened in style to Willie Nelson and Johnny Cash, has been married once, to Rose Madden, but that lasted just a year.
Most recently he was in a relationship with podcast host but they split up just recently having dated for 15 months.
Zach announced the split on Instagram thanking Brianna for loving him "unconditionally" and saying he'd had an "incredibly hard year personally" and "struggled through some pretty severe things".
He asked his fans to "respect Brianna's privacy and space" and blamed himself for the break-up, saying: "I failed people that love me and mostly myself".
She doubled down on the news just half-an-hour later by telling her fans she was taking a break from social media to "heal privately".