"I was in a brace for several weeks and am now moving, jogging and regaining athleticism," Happ told ESPN. "I began running again three or four days ago, and I'm not quite there yet as far as cutting or turning."
After watching the Rays' Alex Cobb take a batted ball to the head last week -- on the same mound he did -- Happ called the incident "eerie."
"Obviously, it was in the same park and it was almost the same, except he's a righty and got hit on the right side," Happ said in the interview.
Happ is currently working out in Dunedin, Fla., at the Blue Jays' Minor League facility. He's progressed far enough that he was able to throw off a mound without a knee brace.
AJ Cassavell is a reporter for MLB.com. Follow him on Twitter @ajcassavell. This story was not subject to the approval of Major League Baseball or its clubs.