Signed his first senior contract with the club in the summer after enjoying a breakthrough campaign in 2025-26, starting in nine matches, including the Investec Champions Cup ties against Bristol Bears, Union Bordeaux-Bègles and Northampton Saints. A Wales U20 international, Jac has brought his attacking threat from Super Rygbi Cymru, where he has shone for Llandovery, onto the URC and Champions Cup stage, showing his ability to counter with pace, footwork and instinct. A product of Ysgol y Glantaf and a graduate of the Scarlets Senior Academy, Jac scored his first senior try against Northampton.