The Marlins said Monday that relief pitcher Juan Carlos Oviedo sustained a sprained ulnar collateral ligament in his right elbow during Saturday’s rehab appearance.

Oviedo left the game at Triple A New Orleans after recording only one out because of right elbow discomfort. Oviedo returned to Miami and underwent an MRI that, according to Marlins manager Ozzie Guillen, the team doctors were evaluating Monday afternoon.

The Marlins did not give a timetable for his return. Oviedo is eligible to return from his eight-week suspension for age and identity fraud next Monday. The Marlins are counting on Oviedo for another closing option as they continue to search for the best candidate for the role.

Steve Cishek, who picked up a five-out save Saturday (his second of the season), said he felt better Monday after dealing with a stomach flu that forced him to leave the ballpark before Sunday’s game.

Ozzie on Harper

Guillen said Monday he felt disrespected by Bryce Harper’s bat-pointing gesture during Sunday’s game after Guillen questioned the amount of pine tar on the Nationals’ All-Star rookie’s bat.

“I don’t know if I did it the right way or the wrong way, I just know I did it my way,” Guillen said. “I gave them a heads up, very professional. I think, in my opinion, this kid disrespected me by doing something like that. I don’t think that was appropriate for him to do.’’

Guillen said he reached out to Nationals manager Davey Johnson to talk about what happened.

“It was a brief phone call,” Johnson said. “I just told him any time an opposing manager has any kind of conversation with my hitter, whether the manager instigated it or my guy instigated it, it’s not something I like to see happen.”

Johnson was quoted Sunday as saying that Guillen might have been trying to intimidate Harper.

“[Johnson] is wrong,” Guillen said. “When you try to intimidate people you throw at his [butt]. What I did was say, ‘Clean it off the bat because it’s illegal.’ He cleaned the bat and showed me the bat. I never intimidate. How can I intimidate with this 200-pound body? That was the last thing that went through my mind. I just thought Harper was unprofessional. He was showing me up. I never showed him up.”

Guillen echoed his previous praise of Harper, but said he felt actions similar to Sunday’s response could trigger a more volatile response from other teams’ managers.

“I like this kid,” Guillen said. “I think he’s good for baseball, but if he continues to do that [expletive], he might not make it. Because he’s going to fool around with the wrong guy and that guy will kick his [expletive]. If he had done that to Tony LaRussa or someone like that, he would have been in trouble.”

•  Edward Mujica was scheduled for a rehab assignment Monday in Jupiter as he recovers from his toe injury. Guillen said if all went well Mujica should rejoin the team in Chicago.

Coming up

•  Tuesday: Marlins RHP Anibal Sanchez (4-6, 4.12 ERA) vs. Chicago Cubs LHP Travis Wood (4-3, 3.05), 8:05 p.m., Wrigley Field.

•  Wednesday: Marlins RHP Josh Johnson (5-6, 4.28) vs. Cubs RHP Jeff Samardzija (6-8, 4.71), 8:05 p.m., Wrigley Field.

•  Scouting report: Sanchez has pitched through the seventh inning only once in his past seven starts after making it seven times in his first 10 starts of the season. He is 1-2 with a 5.66 ERA in four career starts against the Cubs.