Barcelona they returned in their dramatic The League met at Hi.
La Blaugana were stunned in the first 45 minutes as the rotating league leaders went into the break 2-0 up.
A refreshed starting line-up struggled to cope with Osasuna's attack as Ante Budimir and Bryan Zaragoza put the home side into a commanding lead.
Despite the pressure to bring on Lamine Yamal at half time, Hansi Flick stayed with his starting team, and the visitors responded.
Osasuna goalkeeper Sergio Herrera was caught out of position and Pau Victor took his chance to squeeze home a first La Liga goal.
#OsasunaBarca
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That should rally Barcelona for the final stages as they look to at least secure a draw and remain unbeaten in league action in 2024/25.
Barcelona had won all seven league games before the trip to Pamplona this weekend.
Images via Getty Images/One Football