Riccardo Calafiori, Kai Havertz and Martin Odegaard scored as the Gunners secured a convincing victory at Cardiff’s Principality Stadium.
Despite the setback, Dias stressed that City are focused on the Premier League campaign and ready to respond when they face Bournemouth in their opening fixture of the 2026/27 season next Sunday.
“The way the game starts, it sets you off right away and Arsenal get comfortable into playing their game,” he told Man City's website.
“In the end, this is just starting. The most important thing is that we’re already looking forward. We’ll be ready for the next game.
“I joined (pre-season) midway. This is the third game since I’ve been back. The feeling has been good.
“Today it’s frustrating. It was a final and we obviously wanted to win it. If there is a lesson then let it be this one because there’s a lot more coming.”
Get ready for the new Premier League season
The Premier League returns on Friday, August 21st as defending champions Arsenal host new boys Coventry in the 2026/27 curtain-raiser.
Get ready for kick-off ahead of the new season:
- Transfer Tracker: All the latest done deals and rumours
- Premier League fixture list revealed for 2026/27
- All Premier League and top European club kits for the 2026/27 season