The move was made retroactive to Sunday. The outfielder, who is in an 0-for-16 slump, was held out of the Phillies' lineup for the past two games. Manager Joe Girardi had said Harper was being given a break because of his slump.
Girardi said Tuesday that he didn't reveal Harper's injury to reporters the past two games because he didn't want the opposing manager to know the Phillies were playing with a short bench.
"There is a distinct advantage to the other manager if I tell you a guy's wrist is hurt," Girardi told reporters, according to The Athletic. "And the idea here is to win games. ... I understand you want to know. But there are distinct advantages that I can give another club if they know everything that's going on over here. So I'm sorry that I had to do that. But we're trying to win games and he's just not ready to go. I thought he'd be ready on Monday or Tuesday. He's not."
Harper leads the team with a .489 slugging percentage, including 15 extra-base hits and seven home runs, but the slump has dropped his OPS to .884.
The Phillies activated outfielder Roman Quinn from the injured list Tuesday in a corresponding move. Quinn had been sidelined because of a cut on his right index finger that required stitches.
The Associated Press contributed to this report.