Sepp Blatter has been admitted to hospital and is likely to remain there for several days.
The BBC reports the suspended FIFA president suffered what has been described as “a small breakdown” and “nervous shock”, but is expected to make a full recovery.
The 79-year-old was provisionally suspended for 90 days since October amid corruption allegations.
A statement issued by his lawyers said he was “disappointed” the ethics committee had not followed its own code in allowing him an opportunity to be heard.
They claimed the suspension was based on “a misunderstanding of the actions of the attorney general in Switzerland”.
Blatter is also reported to be “fully fighting against the ethics committee decision” and has told friends “no committee can put me out of the game”.
The criminal case centres on whether Blatter misused FIFA money by making a 2m euros (£1.35m) payment to Frenchman Michel Platini for consultation work. They both deny any wrongdoing.
Seven candidates will stand in FIFA’s presidential election to succeed Blatter on February 26.