The German Olympic Committee hopes to prevent Ingo Steuer - accused of once working for East Germany's secret police - attending the Winter Olympics.
Ingo Steuer reportedly adopted the Stasi codename "Torsten"
Steuer, coach of figure skating pairs medal contenders Aliona Savchenko and Robin Szolkowy, denies the allegations.
A German court recently upheld the 39-year-old's injunction against the German National Olympic Committe (NOC).
But NOC chief Klaus Steinbach said: "We will file an appeal in the coming hours with the Berlin court."
The NOC had tried to ban Steuer from attending the Games after the government agency in charge of Stasi documents said he had worked for the feared secret police force.
Steuer, the 1997 pairs world champion and 1998 Olympic bronze medallist with Mandy Woetzel, was aged 23 when the Berlin Wall was brought down in 1989.