The White Sox have placed struggling right-handed reliever Tony Pena on the disabled list with right elbow tendinitis. To fill his roster spot Chicago has recalled right-hander Lucas Harrell from Triple-A Charlotte. Pena missed a handful of games earlier this season with the same ailment, but did not go on the DL that time. He is 1-1 with a 6.20 ERA in 17 relief appearances.