The Orioles optioned infielder Steve Tolleson to Triple-A Norfolk.
Lefty Dana Eveland rejoined the team during Tuesday's game, flying back from California after wife Ashley gave birth to the couple's second child, a boy named Asher Perry, on Saturday night. Eveland was not placed on paternity leave, so he didn't need to be activated.
"With the off-day and everything, we are in pretty good shape bullpen-wise," manager Buck Showalter said of the decision to give Lindstrom an extra day. "We really want to keep Tommy active with a left-handed starter, to be able to have some length right-handed behind [lefty starter Brian Matusz]."
Hunter is a leading candidate to start Saturday's game against Cleveland with Eveland also an option. The Orioles don't have another off-day until the All-Star break.
Lindstrom, who was in the clubhouse prior to Tuesday's game, said the biggest hurdle in recovering from a partially torn ligament in his right middle finger was being able to let the ball go without worrying, which is something he overcame while rehabbing at the team's spring complex in Sarasota, Fla.
"It feels like it's been forever since I've been on the mound, but the rehab went well," said Lindstrom, who last pitched for the Orioles on May 10. "I'm just looking forward to getting back out there in the bullpen with the guys."
Lindstrom made 13 appearances before hitting the DL, pitching to a 1.29 ERA over 14 innings.