Yankees catcher Jorge Posada has a torn hamstring tendon in his left knee and will be sidelined at least a few days. Posada wasn't placed on the disabled list following his MRI exam that revealed the injury, but the club said Thursday that it planned to call up a catcher from the minor leagues on Friday. Posada is scheduled to be evaluated in the next few days. It is the latest in a string of injuries that have hit the Yankees recently.