In 1981, before the 1982 season, he became the first fully professional player in Danish football, when Brøndby chairman Per Bjerregaard offered him a full-time contract.
He played seven games in Denmark's unsuccessful qualification campaign for the 1984 Summer Olympics, scoring a goal against Norway.
This caused problems getting his wage from Granada, but with the intervention of Per Bjerregaard, FIFA got involved, and Chrøis received the approximately £25.000 the club had withheld.
He helped the club win promotion for the top-flight Swiss Super League in 1986, before he decided to move back to Denmark in 1987.
Chrøis moved to lower league club Helsingør IF, alongside Brøndby players Erik Rasmussen and Ole Østergaard.