The Norwegian site langrenn.com reports that all skiers must be double-vaccinated against covid-19 to participate in this weekend's competitions.
According to the site, Sundby has only received one vaccine dose and thus does not meet the requirements to be allowed to compete.
It is medical reasons that are the reason why the Norwegian only received one dose.
Sundby's team manager Tore Björseth Berdal does not want to go into what medical reasons it is about.
"There are medical reasons behind the vaccine status.
In addition, the medical reasons are private.
Martin hopes to be able to take dose two as soon as possible ", writes Björseth Berdal in a text message to SVT Sport.
Will he be able to go this weekend?
"We hope so."