The Scottish full-back is yet to make an English Premier League start for Arsenal despite returning to full fitness last month.
He started in the Carabao Cup against Nottingham Forest and has since got games from the start in the Europa League.
And Tierney got an assist in his first European game for Arsenal – setting up Gabriel Martinelli in a 4-0 win over Standard Liege.
He set up Martinelli again tonight, producing a brilliant cross for the striker to head home:
Tierney really does have a great left foot.
The former Celtic full-back should have his eye on making his Premier League debut for Arsenal – and that could come against Crystal Palace on Sunday.
Arsenal lost to Sheffield United on Monday night in a game they were expected to win so Unai Emery could look to make some changes.