"During the game that took place in Madrid, Vela sustained an injury to his right knee. Tests have revealed a tear in his internal meniscus," the club said on www.realsociedad.com.
"Having reviewed the situation, we have opted for the player to have an operation. Carlos will undergo surgery today (Monday) carried out by doctor Mikel Sanchez."
The 25-year-old former Arsenal player has scored seven goals in 20 league games this season for Sociedad who are 13th in the La Liga table and stand four points above the relegation zone.
(Writing by Ken Ferris; Editing Ed Osmond)
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