Barcelona's Marcos Alonso controls the ball during the Champions League...

Barcelona's Marcos Alonso controls the ball during the Champions League group C soccer match between Inter Milan and Barcelona at San Siro stadium in Milan, Italy, Tuesday, Oct. 4, 2022. Barcelona defender Marcos Alonso will undergo back surgery in the coming days. Barcelona says the surgery is aimed at fixing the “problems in the lumbar region” that have kept Alonso sidelined in recent weeks. Credit: AP/Antonio Calanni

BARCELONA, Spain — Barcelona defender Marcos Alonso will undergo back surgery in the coming days, the club said Sunday.

Barcelona said the surgery is aimed at fixing the "problems in the lumbar region" that have kept the 33-year-old Alonso sidelined in recent weeks.

The club said it will give further details after the surgery is conducted. It did not give a timetable for Alonso's recovery.

He has played seven games this season, four as a starter. He has made a total of 44 appearances with Barcelona, scoring three goals.

Barcelona is in fourth place in the Spanish league, seven points behind leaders Real Madrid and Girona after 18 matches.

The Catalan club visits midtable Las Palmas on Thursday.

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