Dismissal without sick leave: Is there a chance to appeal?

Yes, you can be dismissed for absenteeism if you did not have a valid reason and did not formalize a sick leave, even if you informed your manager, as oral notification is insufficient evidence. If the absence was due to an actual illness that was later confirmed, and you could not obtain sick leave, you can challenge the dismissal in court by providing evidence (medical certificates, testimonies, correspondence) to prove the validity of the reason and restore your rights. Absence from work without valid reasons and proper documentary confirmation (sick leave) is considered absenteeism, which is grounds for dismissal at the employer's initiative. Notifying your manager by phone or messenger is not sufficient legal proof of your incapacity for work, unlike an official sick leave certificate.