Real Sociedad lost the match 1-2. Sadiq, who limped out of the game in the 38th minute, is reportedly facing a long spell on the sidelines and he may not play again this season.
Sunday’s match against Getafe was Sadiq’s third with Sociedad, a club he joined from Almería in the summer market for 20 million euros.
Real Sociedad brought him in to replace Alexander Isak, who left for Newcastle United. Following test results confirming that Sadiq tore his right anterior cruciate ligament, the Royal Society said the Nigerian would undergo surgery soon.
Although the club did not indicate how long Sadiq would be out of action, experts say he could miss the rest of the season.
Sadiq, 25, was Sociedad’s top summer signing. He made an immediate impact by scoring on his debut in a 1-1 draw against Atlético Madrid on 3 September.
He started for Sociedad in their historic first victory over Manchester United at Old Trafford in their Europa League group match on 8 September.
The injury means Sadiq will miss Nigeria’s international friendlies against Algeria on September 27 and Portugal in November. The injury may also cost him Nigeria’s African Cup of Nations qualifier against Guinea Bissau, which has been postponed to March 2023.