However, the sources said the illness is not being called the flu and that Florida officials remain optimistic Tebow, cornerback Joe Haden and safety Major Wright will play Saturday night. Tebow, Haden and Wright were at the team hotel Saturday morning and were not experiencing any fever, according to sources.
A source close to Tebow tells ESPN.com's Mark Schlabach that Tebow was "pretty weak" Friday morning, but is feeling better.
Multiple media outlets reported that several Florida players, including Tebow, were sick with the flu and took a separate plane Friday. The Independent Florida Alligator, the student newspaper at the University of Florida, first reported the story.
Saturday night's game (ESPN2, ESPN360.com, 6 p.m. ET) is No. 1 Florida's first SEC road game of the season.
A source close to the situation told ESPN's Joe Schad the three players arrived in Lexington on Friday evening, at about the same time as the team plane. The source called the illness a "respiratory condition involving congestion."
Wright and Haden missed practice Thursday, while Tebow did not feel sick until Thursday night, according to the source.
Coach Urban Meyer said Thursday that the team has battled more than 35 cases of the flu over the past four weeks, but did not name Tebow among those who had become ill. Meyer said running back Jeff Demps, tight end Aaron Hernandez and defensive end Jermaine Cunningham played with the flu last week against Tennessee, while linebacker A.J. Jones and Haden were among players fighting the virus this week.