The Rays have claimed left-hander John Gaub off of waivers, the Cubs announced. The Cubs also announced that they placed right-hander Marcos Mateo on the 60-day disabled list to create 40-man roster space.
Gaub, 26, appeared in four games for the 2011 Cubs after spending most of the season in the minor leagues. He posted a 3.42 ERA with 12.2 K/9 and 6.5 BB/9 in 55 1/3 innings for the Cubs' Triple-A Iowa affiliate. Left-handed relievers J.P. Howell and Jake McGee made the Rays' Opening Day roster and Cesar Ramos and Alex Torres are minor league options.