CHICAGO (CBS) — As they prepare for their season opener Sunday, the Bears have made some changes to the roster.

The Bears said Saturday that they had elevated running back Armando Allen to the active roster from the practice squad, waived linebacker Patrick Trahan, and placed Lorenzo Booker on injured reserve.

Allen played in two Bears games last season, and carried the ball 15 times for 48 yards. He spent 12 of the 15 weeks prior on the practice squad.

Trahan appeared in five Bears games last season, and recorded five special teams tackles. He was on the practice squad for the first 12 weeks of the season, and spent the 2010 season on the Tennessee Titans practice squad.

Booker has had 230 rushing yards, 363 receiving yards, and 879 kickoff return yards in 36 games with the Miami Dolphins, Philadelphia Eagles and Minnesota Vikings since 2007.

The Bears’ active roster now has 52 players.