According to TEAMtalk, Casilla is under investigation from the FA for alleged racist remarks towards Jonathan Leko - then on loan at Charlton Athletic from West Bromwich Albion - back in September 2019.
It has been reported that the Spanish goalkeeper will face a verdict soon.
If the former Real Madrid goalkeeper is banned, then Meslier will replace him in the team, says Bielsa.
Bielsa told Leeds Live: "Meslier is the option if Kiko doesn’t play. In this situation or in others. When he plays the direction of him was in the level of our expectations."
Is Illan Meslier ready?
Meslier joined Leeds on a season-long loan deal from French club Lorient in the summer of 2019.
The teenager is a very good and promising young player who can be a star in the future.
Meslier must have been desperate for the chance to play for Leeds in the Championship, and if he gets the chance, then he will certainly try his best.
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