It was on Sunday that the ski star fell during a roller-skiing session at Södra Berget in Sundsvall, and then had to be taken to hospital by ambulance, reports Sundsvalls Tidning.
It's broken and it's been confirmed, so it's going to be a cast now as it looks, says Larry Poromaa.
William Poromaa had a tough season last year. Among other things, he struggled with a rib injury after a crash during the Tour de Ski that disrupted his Olympic training.
It is unclear how long rehabilitation will take.
It's clear that it feels heavy for him right now, but it's good to look at things positively. Luckily, there are other ways to train.
The big highlight of the upcoming season is the World Championships in Falun.
What do you think?