Grace was born in Port Talbot and after his time at the Ospreys Academy played for St Helens for six seasons, during which time he won three Super League Grand Finals and the Challenge Cup and played six games for Wales in Rugby League.
He announced he would switch codes to join Racing 92 in July 2022, but suffered a ruptured Achilles tendon while playing for St. Helens in August of that year.
Grace did not play for the French Top 14 team after a relapse of his injury in February 2023.
In April, Bath signed Grace to a contract until the end of the 2024–25 season, which includes the option for him to stay for the 2025–26 season.
Grace joined Bath in February after recovering from a long-term injury and played two friendlies for the club against Gloucester and Leinster in March.
Wales will be without the rested Josh Adams for the summer series. The other three options in the squad are Liam Williams, Cameron Winnett, Rio Dyer, Jacob Beetham, Josh Hathaway and Mason Grady, the latter of whom will play at centre against the Springboks this weekend.