We asked coach Sigi Schmid what's going on.
"In all my years of coaching I’ve always found injuries to be cyclical," he said. "I went through a span at UCLA where we had like five fifth metatarsals in two or three years. And then we went though a span where we had three guys fracture their fibula in like a year and a half. And then all of a sudden we’d have hamstring issues. We never had an ACL.
"It seems like it goes cyclical and right now we’re in a cycle with concussions. It seems like there’s a greater awareness of it: players and trainers and the league, everyone’s a little more sensitive to it. As a result of that some things are more pronounced than they were. I know the couple of times I had a concussion when I played I couldn’t drive home – so that’s how I knew pretty much that I had a concussion. And I don’t remember anything about the games.
"It rarely happens when you’re up clean for a header and you’re heading the ball. It happens when you get surprised by the ball, you’re hit in the back of the head by the ball or a teammate, you didn’t see it coming or something like that.
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"Obviously Parke drove home last night and stuff like that. Yeah, it’s there, there are some symptoms for sure, and we’ll be very cautious with it."