Assuming he passes a physical this morning in Baltimore, right fielder Jay Gibbons officially will be announced today as the third member of the Orioles' lineup signed through 2009 - joining shortstop Miguel Tejada and new catcher Ramon Hernandez. Gibbons, who turns 29 in March, agreed to a four-year extension yesterday that is worth just over $21 million, The Sun has learned. Facing an arbitration hearing next month, the Orioles and Gibbons' agents, Sam and Seth Levinson, began discussing a contract extension in December. During much of the negotiations, the sides were focused on a three-year pact that would have allowed Gibbons to avoid arbitration in 2006 and stay with the team through 2008.