Happ was released from a Tampa-area hospital on Wednesday morning after he was hit in the head with a line drive during Tuesday night's game against the Tampa Bay Rays at Tropicana Field.
Happ left Bayfront Medical Center on crutches and with a bandage around his head, according to reports. On Wednesday afternoon, the Blue Jays placed the pitcher on the 15-day disabled list.
The team said in a release that Happ was in "good spirits" and described his injuries as a head contusion and laceration to his left ear. He escaped a more serious injury in a scary incident that saw him bleeding profusely and carried off the field on a stretcher.
Philadelphia Phillies right-hander Roy Halladay will undergo arthroscopic surgery on his right shoulder and it's uncertain whether he'll be able to pitch again this season.
The surgery will be performed by Dr. Lewis Yocum in Los Angeles to repair a bone spur in his throwing shoulder. Halladay is currently on the 15-day disabled list after battling inflammation.
Halladay, 35, is 2-4 with an 8.65 ERA in seven starts this season.
Former major-league pitcher Carlos Zambrano signed with the Long Island Ducks of the independent Atlantic League in an attempt to resurrect his career, MLB.com reported.
Zambrano, a free agent, pitched for the Miami Marlins last year and posted a 7-10 record with a 4.49 ERA but did not draw interest from teams during the offseason.
His career record is 131-91 with an 3.66 ERA, and his best seasons were from 2003 to 2008 when he won between 13 and 18 games.
Los Angeles Dodgers shortstop Hanley Ramirez has a strained left hamstring and could be out for four to six weeks, according to a report.
An MRI taken this week confirmed the strain, TrueblueLA.com reported. Ramirez's projected return would be early June.
Ramirez suffered the injury while running the bases on Friday night in a game against the San Francisco Giants.
The Oakland Athletics added Josh Reddick to their list of injured outfielders, placing him on the 15-day disabled list with a sprained right wrist before their game against the Cleveland Indians.
A's outfielders Coco Crisp (hamstring) and Chris Young (quadriceps) are already on the DL.
Reddick was hurt on April 7 in Houston when he hit the wall chasing a popup in foul territory. He sat out three games but tried to keeping playing and struggled. His .152 batting average is the third lowest in the American League.