That was the diagnosis given to the Ducks’ center, who was among the team’s hottest players at the time of his injury Thursday. Kings center Jarrett Stoll fell on top of Koivu at 11:38 of the second period; Koivu won the draw but immediately limped off to the Ducks’ bench and did not return to the game.

Koivu has 10 goals and 29 points this season, but had two goals and six points in his last six games. While the injury shouldn’t put Koivu’s Olympic appearance for Team Finland in jeopardy, the same can’t be said for Teemu Selanne, who underwent surgery Thursday to repair a broken jaw and is expected to miss 2 to 6 weeks.

The Ducks host the Calgary Flames at 5 p.m. Sunday.