A 2023 signing from Peterborough United, defender Arthur made his debut in the Carabao Cup shootout win against Aston Villa last month.
After two seasons with Brentford's specialist B team, Arthur is proud to now be a member of Keith Andrews' senior squad.
He told the club's website: “It has been a great opportunity this season.
“From day one of pre-season, I had my targets set and I’m really happy to have made my debut. I’ve been working hard to get better every day and, in football, you have to keep a level head.
“From day one, the B-team plan was clear.
“When I look back on the elite European men’s teams we faced, those experiences definitely helped me prepare for my debut."
