Matt Barnes has been suspended four games and fined an undisclosed amount for throwing a fastball past the head of Manny Machado on Sunday.
Barnes is appealing, meaning he can pitch for the Boston Red Sox until the appeal is heard.
"I would never intentionally throw at someone's head. That's kind of a line you don't cross," Barnes said.
On Friday night, Machado made a late slide that injured Dustin Pedroia, who is day-to-day after visiting doctors at Massachusetts General Hospital.
John Farrell defended Barnes, saying Sunday that the pitch "got away from him."