Martin Broberg - who played in Degerfors, Djurgården, Odds BK and now Örebro, is fighting testicular cancer.
On Wednesday, the 31-year-old midfielder underwent surgery.
- I received a text message from him afterwards.
I don't have much information.
Everyone in the club thinks it's very boring and everyone is behind him, says marketing manager Adam Pettersson to SVT Sport.
On its website, the club writes:
"All our thoughts and support go to Martin and his family.
ÖSK Fotboll, together with Martin, wants to ask for understanding and respect for the tough situation and let him and the family deal with this in peace and quiet".
Örebro is in ninth place in the super league.