The Denver Broncos on Sunday signed safety Josh Barrett, guard Mitch Erickson, quarterback Darrell Hackney and defensive tackle Steven Harris to their practice squad, Head Coach Mike Shanahan announced. Barrett (6-foot-3, 225 pounds) is a rookie from Arizona State University who was selected by the Broncos in the seventh round (220th overall) of the 2008 NFL Draft. He played in all four Denver preseason games in 2008, ranking fourth on the club in defensive tackles (11) and tying for third in special-teams stops (2). A two-year starter at Arizona State, Barrett attended Reno High School in Reno, Nev., and was born on Nov. 22, 1984. Erickson (6-foot-6, 290 pounds) is a rookie from South Dakota State University who entered the NFL with the Broncos as a college free agent on April 28. He appeared in all four preseason games for Denver in 2008 following a collegiate career in which he received first-team All-America honors from the Associated Press as a senior at SDSU. Erickson attended Hutchinson High School in Hutchinson, Minn., and was born on May 14, 1985. Hackney (6-foot-0, 248 pounds) is a second-year player from the University of Alabama-Birmingham who spent the final eight games in 2007 on Denver's 53-man roster after beginning that season on its practice squad. In four games (1 start) with the Broncos in the 2008 preseason, Hackney completed 24-of-38 (63.2%) passes for 285 yards with one touchdown and no interceptions (94.7 rt ...