Mark Kotsay agreed to a three-year contract extension with the Oakland Athletics on Saturday, keeping the reliable center fielder with the club through the 2008 season. The deal is a two-year extension worth $15 million, ESPN's Peter Gammons reports. The deal supercedes the final year of his current contract, a five-year deal through the 2006 season. The total amount Kotsay will earn through 2008, including 2005, is $29 million. Kotsay also has a no-trade clause through 2006, Gammons reports. Kotsay, acquired after the 2003 season from San Diego for Ramon Hernandez and Terrence Long, was batting .278 with six home runs and 43 RBI in 82 games with the A's this season heading into Saturday's game against the White Sox in Chicago. In addition to Kotsay, five other five players signed beyond 2005 are: Eric Chavez, Bobby Crosby, Keith Ginter, Rich Harden and Jason Kendall. Kotsay had been the subject of trade rumors over the past few weeks.