"We'll see how long he needs [to be] there," Orioles manager Buck Showalter said. "They have a good, long homestand."
Hardy was hitting .200 through 15 at-bats this season before going on the disabled list.
Meanwhile, left-hander Brian Matusz (strained left intercostal muscle) continues to show steady progress.
"Matusz had a good batting practice session today and he'll throw on Saturday," Showalter said.
Right-hander Justin Duchscherer (left hip strain) has had two batting practice sessions, but Showalter said it's too early to project a rehab assignment date for him.
"So far, so good," Showalter said of Duchscherer.