The Rangers designated left-hander John Gaub for assignment, Anthony Andro of FOXSportsSouthwest.com reports (on Twitter). The team is placing Derek Holland on the disabled list and calling up Tanner Scheppers in corresponding moves.
The Rangers recently claimed Gaub off of waivers from the Rays, who had claimed him from the Cubs earlier this year. Gaub, 27, has a 3.43 ERA with 10.7 K/9 and 6.0 BB/9 in 21 innings for the top affiliates of the Rays and Rangers in 2012. He appeared in four games for the Cubs last season and has a 3.69 ERA with 11.7 K/9 and 6.3 BB/9 across parts of four Triple-A seasons.