"Bergesen did not throw yesterday," said manager Dave Trembley. "I think his throwing program has been curtailed until he's more pain-free and there is no limp. He threw [Monday] and it bothered him when he landed."
Bergesen was originally injured by a comebacker that caught him in the left shin, and he had to walk on crutches for a week to keep his weight off his leg. The right-hander was initially encouraged by his flat-ground throwing session on Monday, but Trembley convinced him not to progress until he's completely pain-free.
"He said he thought he could kind of throw through it," said Trembley of his rookie starter. "He thought he was going to have a little pain there, but we just don't want to have him throw like that and alter his motion."
Bergesen, who started the season with Triple-A Norfolk, was the first of Baltimore's pitching prospects to stick in the rotation. He's logged a 7-5 record and a 3.43 ERA in his first big league season, and his presence has been sorely missed in the past two weeks. And even without him, the Orioles have four rookies in the rotation.
Baltimore originally thought that Bergesen would be out for the minimum amount of time. But after the latest setback, the newest timeline has Bergesen returning sometime in the last week of August.
"I got an update from [head athletic trainer Richie Bancells] and they've kind of pushed it back," said Trembley of the prognosis. "He's eligible to come off [the disabled list] on the 15th. Obviously, he's not going to be ready to come off on the 15th now. They're saying more towards the end of [August] that he would be ready to come here."
Two other Orioles -- Koji Uehara and Rich Hill -- took the next step in their respective rehabilitations on Wednesday. Uehara, who's recovering from a partially torn flexor tendon in his pitching elbow, flew to the team's Minor League complex in Sarasota, Fla. Hill, who recently had surgery on his shoulder, followed later in the day.
Uehara is expected to return in September, while Hill won't pick up a baseball for a few months.
Spencer Fordin is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.