"Everything looks good," manager John Gibbons said before Saturday's game against Philadelphia.
House was struck in the ninth inning of a game against the Detroit Tigers on Friday and was taken to Lakeland Regional Medical Center. Test results were normal, and he was held overnight for observation.
"I'm going to make a full recovery," House said on Twitter. "Things are looking good."
House called this the "scariest" moment of his career.
Tigers manager Brad Ausmus said "there was blood on his face, blood in the glove -- everything." He described it as among the most frightening things he has seen in a baseball game.
House was hit on the back of the head by a ball off the bat of John Hicks. The ball ricocheted about 30 feet into the air before catcher Mike Ohlman caught it.
House fell to his stomach and was face-down on the mound for nearly 20 minutes while trainers tended to him. House was put onto a stretcher and gave the crowd a thumbs-up as he was placed into an ambulance.
The 27-year-old pitcher was talking immediately after he was hit and had feeling in all of his extremities.