"Rondon was sick today," Ausmus said. "Nothing major, but just to be safe, he was sent home."
Rondon was in the clubhouse at Joker Marchant Stadium Friday morning and took part in the Venezuelan Tigers' show of support for folks back home. Soon after that, he was spotted in street clothes leaving the facility.
"He was here, and there was some question whether he could go out or not," Ausmus said. "But I think in the end, the proper decision was made. … We don't want anything lingering or getting anyone else sick."
Ausmus said the illness probably wasn't enough to be classified as flu-like symptoms.
Rondon was not scheduled to throw Friday. He threw a full session of live batting practice on Thursday, which would put him on track to throw again on Sunday.
Jason Beck is a reporter for MLB.com. Read Beck's Blog and follow him on Twitter @beckjason. This story was not subject to the approval of Major League Baseball or its clubs.