Midfielder Killian Phillips joined St Mirren in August 2024 on an initial loan from English Premier League side Crystal Palace.
The Irishman then becomes a permanent Saints player until summer 2026, with the club holding an option to extend for a further year.
Arsenal 0-1 PSG, full time.
Arsenal had a goal, tightly, chalked off early in the 2nd half, after that the game fizzled out.
Arteta should have made more changes early on but shat it when two or three key players were clearly struggling.