PRAGUE -- Two-time biathlon world champion Gabriela Koukalova has been ruled out of next month's Pyeongchang Olympics.
The Czech Biathlon Union says Koukalova won't recover in time from a calf problem that has kept her out of World Cup events so far this season.
Koukalova says "I tried my best to return" in time for the Olympics, but "unfortunately, I could not train as I had hoped. I'm very disappointed."
Koukalova is the reigning world champion and World Cup title holder in the sprint and also has two Olympic silver medals.