This was announced by Metz, the 19-year-old's club.
"The management, players, coaches and others concerned are in shock and deeply affected by this news. They express their deepest sympathy to Tahirys at this difficult time," the French Ligue 1 club wrote.
Tahirys Dos Santos has been taken to a hospital in Germany. His injuries are said to be serious.
Tahirys Dos Santos has not played for Metz's first team, but as recently as December 20 he was on the bench in a cup match.
At least 40 people are dead and 115 injured, many seriously, after the fire that broke out at a bar on New Year's Eve.
