Juan Rivera is scheduled to undergo an MRI on his left leg Wednesday. Rivera left Tuesday's game after he experienced numbness in the back of his knee on a slide into third base. The 33-year-old described it as a "pins-and-needles" sensation and the medical staff suggested it could be nerve-related. He did miss two games last month due to a strained left hamstring, so it's possible the two injuries are related. It's not clear when he'll return to the lineup, but the recently-signed Bobby Abreu figures to benefit in the short-term.