An official announcement is expected to be made Thursday at a press conference in Gainesville.
O'Sullivan was also considered a candidate at Tennessee, but his interview in Gainesville Wednesday went so well that school officials offered him the job.
O'Sullivan, 38, is known throughout the country as one of the more relentless and tireless recruiters in the nation, as evident by the continuous high ranking signing classes the Tigers have on an annual basis.
During his tenure at Clemson, which began in 1999, the Tigers have been known for having some of the best pitching staffs in the ACC and in the Southeast. The last two seasons are proof as such.
This year alone, the Tigers had three pitchers drafted in the top few rounds. He also has had 28 of his former Clemson pitchers sign professional contracts.
While a member of the Clemson staff, the Tigers made three trips to the College World Series.
O'Sullivan's hiring comes exactly one week following the dismal of former Gators coach Pat McMahon. He will be the 21st head coach in Florida history. Conversely, the Tigers have had only two head coaches since 1958.
Clemson coach Jack Leggett now has to begin the search of finding O'Sullivan's replacement, which will be very huge shoes to fill.
Sully to Florida
CUTigers.com Top Stories
3-22 RECRUITING RADARIn our weekly Recruiting Radar, CUTigers Recruiting Analyst Gary McDaniel updates you on the latest news and intel on the Clemson recruiting front!
CUTigers.comWednesday at 11:14 AM
TIGERS TEE OFF ON C OF CRed-hot ACC Player of the Week Chris Williams hit his 4th and 5th home runs in 8 days and Beer and Davidson also went yard, as #6 Clemson won its 16th of the last 18 games.
CUTigers.comTuesday at 7:48 PM
BROWNELL REMAINS AT CLEMSONDespite widespread speculation about Brad Brownell's job security after a disappointing season, he will remain at Clemson for at least one more season.
CUTigers.comMonday at 10:08 AM
TIGERS TAKE SERIES!!!Pat Krall allows just one run and #9 Clemson slugs its way to its 15th win in the last 17 games, taking 2 of 3 from #11 UVA!
CUTigers.comSunday at 4:31 PM