The 28-year-old Chilean international will be out for roughly nine months, keeping him sidelined potentially through May 2023.
Mora previously underwent arthroscopic debridement surgery on his left knee on Feb. 18, recovering to score one goal in seven substitute appearances totaling 78 minutes of play. But symptoms persisted and now require further and more extensive intervention.
Mora initially joined Portland in 2020 on loan from Liga MX’s Pumas UNAM before securing a permanent transfer in January 2021. He’s posted 19g/7a across 55 regular-season matches (35 starts), and helped the Rose City side host MLS Cup 2021 before falling on penalty kicks to New York City FC.