Happ was hit on the side of the head by a line drive come-backer off the bat of Desmond Jennings during Tuesday's game. He laid on the ground for several minutes before being carted off the field and taken to the hospital. He reportedly was responsive during the process and was doing well earlier this morning.
Here is MLB.com's video of the incident, though a word of warning in that it may be hard to watch for some people.
A time table for Happ's recovery has not been announced. The focus for the team will certainly be on Happ's long-term health rather than getting him ready to pitch right away.
Gonzalez, a right hander, pitched two games earlier in the year for Toronto, giving up two runs in 3.1 innings. This is the first year in Toronto for the 30-year-old after spending parts of nine seasons between four other franchises. In four minor league starts this season, he has a 5.49 ERA.