The reigning National League MVP said he took swings Wednesday and felt no issues with his back.
Bellinger said he simply had a "knot" in his back and was adamant he did not injure himself swinging at golf balls at Albert Pujols' annual charity event Sunday at Topgolf in Scottsdale, Arizona.
MLB had tweeted out video of Bellinger and Mike Trout launching golf balls.
Bellinger said he understands why there was speculation he hurt himself swinging a golf club, "but that wasn't the case."
"It makes sense," Bellinger told reporters, acccording to MLB.com. "I understand, but that wasn't the case. I'm 100%. You guys can write that: the 100 emoji."
He was not in the lineup for Wednesday's spring training game against the Giants, but manager Dave Roberts said Bellinger would return against the A's on Thursday.