[9] On 30 August 2019, Foster joined Monaco's feeder club Cercle Brugge in Belgium on a season-long loan.
[10][11] On 13 August 2020, Foster joined Vitória de Guimarães for a transfer fee of 1.2 million euro.
[13] In the summer of 2022, Foster moved to Westerlo on a permanent basis and signed a four-year contract with the club.
[14] In January 2023, Foster signed for EFL Championship club Burnley on a four-and-a-half-year contract.
[19] He made his return after a two month break when Burnley faced Everton[20] and went on to score in their final fixture of the year against Aston Villa.