The deal is worth $1.5 million plus incentives, the website (www.mlb.com) reported.
Harden, 29, pitched for Oakland from 2003-2008 before being traded to the Chicago Cubs in July 2008. He signed with Texas after the 2009 season.
The right-hander went 5-5 with the American League champions in 2010 but did not pitch in the postseason. He has a 55-34 overall record in a career hampered by injuries.
(Writing by Gene Cherry in Salvo, North Carolina; Editing by John Mehaffey)