Guay needed some clean-up around the meniscus of his left knee druing a procedure on Tuesday, but doctors found no ligament damage.
Guay is targeting a return to competition in October as Canadian winter athletes gear up for the 2014 Sochi Olympics.
"My knee had been feeling good and I was able to do everything in the gym with no pain. I only feel it on skis," the native of Mont-Tremblant, Que., said Thursday in a release. "They basically just cleaned up the knee so I'm going to be off for a little while now. I just have to roll with it.
"For sure I'm thinking about Sochi, it's always in the back of your mind, but I've just got to take things step by step."
Guay has 19 career World Cup podium finishes, second among Canadian men only to Steve Podborski's 20.
He originally hurt his left knee in March but he was able to ski through the problem and complete his World Cup season.