Player Roster

After starting eight games for 49ers in 2008, O’Sullivan was active for every Bengals game last season in No. 2 QB role … Played in three games following coaches’ decisions to rest Carson Palmer … Entered NFL in 2002 as a sixth-round draft choice of New Orleans, but did not see action as a passer until 2007 with Detroit … NFL totals include 17 games played with eight starts.

2009 RECAP: Signed with Bengals on March 6, as UFA from San Francisco … Played in Games 7, 13 and 16 … Saw first action of regular season in lopsided win Oct. 25 vs. Chicago, playing most of fourth quarter, with no pass attempts and two-for-nine rushing … Saw action in fourth quarter Dec. 13 at Minnesota, passing one-for-three for nine yards … Played most of second half Jan. 3 at N.Y. Jets, passing three-for-eight for 31 yards with no TDs or INTs … Appeared in all four preseason games, making three starts as injury replacement for Carson Palmer, and posted 125.8 passer rating, completing 71.8 percent (28-39) for 358 yards with three TDs and no INTs.

PREVIOUS SEASONS: 2008 - Earned his first No. 1 job in NFL by winning preseason roster battle with Shaun Hill and Alex Smith … Posted 91.9 preseason passer rating … 49ers were 2-6 in his eight regular-season starts … Made first career start in 23-13 loss Sept. 7 vs. Arizona, passing 14-for-20 for 195-0-1 … After leading overtime win at Seattle (see previous item), he moved 49ers to a 2-1 record in a 31-13 win Sept. 21 vs. Detroit … Posted 123.3 passer rating vs. Lions, completing 16-of-23 for 189-2-0 … TD passes vs. Detroit were six yards to WR Isaac Bruce and 24 yards to TE Delanie Walker … Threw for three TDs Oct. 5 vs. New England, but also suffered three INTs in 30-21 loss … Made his last start of season Oct. 26 vs. Seattle; was replaced by Shaun Hill in second quarter after passing 13-of-21 for 131-0-1.

2007 — Signed Feb. 7 by Chicago … Waived by Bears on July 6 … Signed July 13 by Detroit, and was on Lions roster all season, playing in four games … Passed 13-for-26 for 148 yards, with one TD and two INTs … Saw the bulk of his action on Sept. 16 vs. Minnesota, filling in for starter Jon Kitna for two quarters, going 13-for-24 passing for 148-1-2 … Took snaps at end of game on Nov. 4 vs. Denver and Dec. 2 at Minnesota, and passed zero-for-two Dec. 16 at San Diego.

2006 — Opened preseason with Minnesota, and was waived Sept. 2 … Signed Sept. 5 to New England practice squad … Released from New England practice squad on Oct. 2 … Signed Dec. 27 to Carolina practice squad … Did not earn an accrued year of experience.

2005 — Waived by Green Bay on Sept. 4 … Signed Sept. 5 to Chicago practice squad … Signed Nov. 8 to Minnesota’s 53-player roster … Served as Vikings third QB (did not play) for Games 9-16.

2004 — Opened season with New Orleans, was inactive third QB for Games 1-4 … Traded along with a second-round draft pick on Oct. 4 to Green Bay, Saints acquiring DB Mike McKenzie and a conditional 2006 draft choice … Served as Packers third QB for final 11 games, and saw first official game action in a kneel-down situation in season-ending win on Jan. 2 at Chicago.

2003 — Did not play, but again on roster all season as Saints inactive third QB.

2002 — Drafted by New Orleans in sixth round (186th overall) … Did not play, but on roster all season as Saints inactive third QB.    

COLLEGE: Played four seasons (1998-2001) at Division II California, Davis, three as the starting QB, and finished career as Aggies all-time leader in total offense (11,544 yards) … Passing totals were 669-of-1070 for 10,745 yards … Threw more than twice as many TDs (96) as INTs (41) … Set school records as a senior for passing yards (3826) and TD passes (38) … Rushed for 473 yards as a junior.

PERSONAL: Hometown is Burbank, Calif. … Attended Jesuit High School in Carmichael, Calif., where he set five football records, including career passing yards, and was a team captain as a senior … Also an all-league catcher on Jesuit baseball team.