The Athletics have signed veteran right-handers Jason Jennings and Brett Tomko to Minor League contracts. Jennings owns a 62-74 lifetime record and 4.95 ERA in 225 games, including 180 starts, in nine big league seasons. Tomko's career line includes a 100-102 mark and 4.65 ERA in 389 games (266 starts) over 13 Major League seasons.