Hazard didn't train with his team-mates on Tuesday, only to return to training on Wednesday. However, he was unable to complete the session and further scans revealed that he had developed a muscle injury.
A statement from the club read:
Thought some outlets have reported he faces a month on the sidelines, he is expected to be back quicker.
He is now, however, expected to play against Huesca.
Dani Carvajal, Lucas Vazquez, and Fede Valverde are all likely to miss out also.
After missing the last few games, Sergio Ramos was expected to be fit for this one, but did not take part in group training on Friday and appears to be still unable to feature.
Real Madrid have, however, been boosted by the return of Nacho, who recently turned in a negative coronavirus test and is available to come in at right-back.
With Martin Odegaard now away on loan and Valverde missing, the midfield three picks itself, with Luka Modric, Toni Kroos, and Casemiro all to retain their place from the loss versus Levante.
Marco Asensio and Karim Benzema are certain starters, but as for the other position, Zinedine Zidane has to choose between two players he doesn't really trust - Vinicius Jr and Isco.
The Brazilian will probably be given the nod.
Eder Militao, meanwhile, is suspended.