Foster joined the French giants in January for a reported £1.08m (R20.7m) fee after impressing the side during two separate training stints before his 18th birthday.
And after just four starts in the Championnat National 2 with the club's reserve side, the teenager has seemingly impressed head coach Leonardo Jardim.
Foster's return of two goals in the four appearances has earned him a call-up to the first team for this weekend's clash against second-placed Lille.
However, it remains to be seen whether the Portuguese tactician will afford the former Buccaneers starlet his top-flight debut.
The 2016/17 Ligue 1 champions are currently in 17th place, six points safe of the final relegation spot.