Vitor Roque scored his first goal for Barcelona in their first match since manager Xavi announced he was leaving at the end of the season.
Joao Cancelo’s cross with the outside of his boot was headed home in the 63rd minute by substitute Roque, who joined the action just a minute earlier.
Osasuna defender Unai Garcia was sent off four minutes later after fouling 18-year-old Brazilian Roque.
Barca moved up to third, eight points behind La Liga leaders Girona.
It was a much-needed win for boss Xavi, who revealed his exit plans after Saturday’s 5-3 home defeat by Villarreal.
His side suffered an early blow when forward Ferran Torres tearfully went off injured after five minutes.
Jules Kounde headed over the bar twice from corners in the first half as the hosts dominated.
After Roque’s goal, 12th-placed Osasuna had chances to level despite having Unai Garcia dismissed for a second booking.
Raul Garcia’s low shot hit the woodwork with 15 minutes left, while Barca keeper Inaki Pena also made a superb flying save to deny Jon Moncayola.
Line-ups
Barcelona
Formation 4-3-3
- 13Peña Sotorres
- 23Koundé
- 4Araújo
- 33Cubarsí
- 2Cancelo
- 22Gündogan
- 8PedriBooked at 53minsSubstituted forRomeuat 77′minutes
- 21F de Jong
- 27Yamal
- 9Lewandowski
- 7F TorresSubstituted forLópezat 7′minutesSubstituted forRoque Ferreiraat 62′minutes
Substitutes
- 15Christensen
- 16López
- 18Romeu
- 19Roque Ferreira
- 26Astralaga
- 30Casadó
- 31Kochen
- 35Hernández
- 39Fort
Osasuna
Formation 5-3-2
- 13Fernández
- 12Areso
- 4GarcíaBooked at 67mins
- 5García
- 28Herrando
- 22Mojica
- 7MoncayolaSubstituted forBarjaat 83′minutes
- 6TorróSubstituted forIbáñezat 83′minutes
- 10OrozSubstituted forBrasanacat 68′minutes
- 17BudimirSubstituted forGarcíaat 68′minutes
- 20ArnaizSubstituted forGarcíaat 68′minutes
Substitutes
- 1Herrera
- 3Álvaro Armada
- 8Brasanac
- 11Barja
- 14García
- 16Gómez
- 19Ibáñez
- 23García
- 24Catena
- 31Valencia
- 34Muñoz
- Referee:
- Jorge Figueroa Vázquez
- Attendance:
- 37,888
Live Text
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Match ends, Barcelona 1, Osasuna 0.
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Second Half ends, Barcelona 1, Osasuna 0.
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Attempt missed. Kike Barja (Osasuna) header from the centre of the box misses to the right following a corner.
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Corner, Osasuna. Conceded by Frenkie de Jong.
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Foul by Ronald Araújo (Barcelona).
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Pablo Ibáñez (Osasuna) wins a free kick on the left wing.
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Frenkie de Jong (Barcelona) wins a free kick in the defensive half.
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Foul by Darko Brasanac (Osasuna).
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Offside, Barcelona. Vitor Roque is caught offside.
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Attempt blocked. Robert Lewandowski (Barcelona) right footed shot from outside the box is blocked. Assisted by Ilkay Gündogan.
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Offside, Barcelona. Robert Lewandowski is caught offside.
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Attempt missed. Pablo Ibáñez (Osasuna) header from the left side of the six yard box misses to the left. Assisted by Rubén García with a cross following a corner.
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Corner, Osasuna. Conceded by Ilkay Gündogan.
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Attempt blocked. Rubén García (Osasuna) left footed shot from outside the box is blocked. Assisted by Jesús Areso.
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Substitution, Osasuna. Pablo Ibáñez replaces Lucas Torró.
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Substitution, Osasuna. Kike Barja replaces Jon Moncayola.
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Attempt blocked. Ilkay Gündogan (Barcelona) right footed shot from outside the box is blocked.
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Ilkay Gündogan (Barcelona) wins a free kick in the attacking half.
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Foul by David García (Osasuna).
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Foul by Ronald Araújo (Barcelona).
