After finishing school in 2018, Scannell entered Munster's sub-academy and began playing in the amateur
All-Ireland League with
Limerick club
Young Munster. Scannell was overlooked for promotion to Munster's academy, so instead, at the age of 19, he signed a two-year academy contract with French club
Biarritz ahead of the 2019–20 season. The deal meant that Scannell would train full-time with the club's senior squad, whilst initially playing matches for the
espoirs, or under-23s, side. Scannell joined
Fédérale 1 club Stade Lagonnais on loan for the 2021–22 season. ==International career==