In May 2022 Joseph received his first call-up to the senior England squad by coach Eddie Jones for their tour of Australia.[6] On 9 July 2022 he made his senior debut for England as a late substitute during their second test victory at Lang Park.[7] He was an unused substitute for the final game as they beat Australia at Sydney Cricket Ground to win the series.[8]
In May 2023, Joseph initially made Steve Borthwick's 38 man World Cup training squad ahead of the 2023 Rugby World Cup to be contested in France. He was ultimately cut from the squad the following month, alongside Beno Obano as Borthwick shrunk his squad to 36 players.[9]