Johaug's suspension for testing positive for anabolic steroid clostebol while training in Italy in September of last year is due to expire on November 18.

However, the FIS are hoping CAS will extend the Olympic gold medallist and seven-time world champion's ban as they claim the 13-month suspension, handed down by the Norwegian Olympic and Paralympic Committee and Confederation of Sports' (NIF) Adjudication Committee, was too lenient.

FIS described it as "on the low end of the range of reasonable sanctions" when they filed their appeal in March.

Should CAS rule in favour of the FIS, the 28-year-old could face further time out of the sport, which would put her chances of participating at next year's Winter Olympic Games under serious threat.

The event in the South Korean resort is scheduled to take place from February 9 to 25.

Johaug has always denied wrongdoing and claimed to have used the substance inadvertently via a sun cream that was wrongly given to her by a team doctor.

Anti-Doping Norway argue she should be blamed for "not having undertaken further investigation of the drug she received and used", which came in a package marked with the word "doping".

They recommended a 14-month suspension before this was reduced by a month in the eventual NIF verdict.

However, the skier, who said she used the sun cream to treat cracked lips, insisted her doctor had given her the all-clear to apply it.

Last month, Norwegian national team manager Vidar Löfhus promised Johaug a place in the squad when her suspension comes to an end.

Löfhus also said they were hopeful her ban would be "shortened rather than lengthened".