He has progressed through the St Helens scholarship programme and represented England U16 as well as the Lancashire Academy, debuting off of the bench against Salford Red Devils at the back end of the 2020 season.

Foster made his first team début for St Helens, coming off the substitute interchange bench against the Salford Red Devils on 26 Oct 2020.

[3] Due to end-of-season fixture congestion caused by the COVID-19 pandemic, Saints fielded a very young side, resting the majority of first team players, in preparation of their derby match against the Wigan Warriors just four days later.

This loan was discontinued after Foster suffered a dual jaw break within the squad's first round game against the Wigan Warriors.

[6] During the backend of the 2023 Betfred Super League season, it was reported that he had joined Swinton Lions on a dual-registration basis that had been agreed with current club at the time, St Helens RLFC.