The Astros added right-hander Paul Clemens to the 40-man roster and signed right-hander Lance Pendleton to a Minor League contract with an invite to Spring Training, the club announced Friday.

The 23-year-old Clemens went 8-7 with a 3.81 ERA in 26 starts between Double-A Mississippi, Double-A Corpus Christi and Triple-A Oklahoma City last season. Clemens was a Southern League All-Star and finished 2011 as the No. 5 prospect in the organization, according to MLB.com. He was acquired from the Braves in the Michael Bourn trade.

Pendleton, 28, posted a 6.75 ERA in 15 relief appearances for the Astros and Yankees last season.

Pendleton began his season as a Rule 5 Draft pick by the Astros before being returned to the Yankees during Spring Training. He spent most of his season with Triple-A Scranton/Wilkes-Barre, going 3-4 with a 3.11 ERA in 18 games, including 10 starts. The Astros claimed Pendleton off waivers from New York on Sept. 9, and he finished his season with the Major League club.