Flores plays for Mexican side UANL Tigres and was on the pitch for the club's CONCACAF Champions Cup final on Sunday (AEST) against Toluca when he went down with a non-contact right leg injury.

He appeared to catch his foot in the grass while dribbling the ball.

Both Flores and Canada manager Jesse March have since confirmed the player's diagnosis.

"Sorry, I haven't gotten back to anyone yet, really rough times. My ACL is gone," Flores posted on social media.

"I wanted to say thank you to everyone and all the messages. I haven't been on my phone or checked messages, but I promise to get around to everyone and I really appreciate the concerns. I'll be back stronger."

Flores's injury occurred just one day after Marsch named him among Canada's 26-man roster for the 2026 FIFA World Cup. It's not yet known who will replace him on the squad list.

Flores, 22, was gearing up for his first FIFA World Cup appearance. He was not part of the Canada squad that competed in 2022 in the country's first appearance since 1986.

He originally committed to the Mexico international team before filing his one-time switch to represent Canada.

Flores had four goals for Tigres in the 2025-2026 campaign, and adding to his misery it lost the Champions Cup final to Toluca 6-5 in a penalty shootout after the sides were locked at 1-1 after 120 minutes of open play, with both goals scored in extra-time.