The Netherlands international had to miss Friday's trip to the Ramon Sanchez Pizjuan, where Barca have been annoyed in a goalless stalemate.
It became confirmed a day earlier that De Jong had been ruled out through damage, although the club did no longer display what the problem was.
Following further scientific tests, Barca had been capable to decide the previous Ajax skills is suffering with a trouble in his soleus muscle inside the right calf.
However, the club have now not commented on how lengthy he could be out for, announcing the "evolution of the harm will situation the player's availability."
De Jong is in his first season at Camp Nou and has made 38 appearances across all competitions.
Barca are next in motion at domestic to Athletic Bilbao on Tuesday, however through then they could have surrendered their area atop of LaLiga.
Friday's draw in Seville leaves them just three points beforehand of Real Madrid, who have a sport in hand.
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Should Los Blancos win that match – away to Real Sociedad on Sunday – they'll go top of the league because of their advanced head-to-head report towards Barca.
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