(CBS) The Chicago Bears have trimmed their roster down to 53 after cutting 20 players, the team announced Saturday.

Among the cuts were offensive lineman Michael Ola and linebacker David Bass, who both started games for the Bears last season.

Ola started 12 games on the Bears’ offensive line last season, playing both the guard and tackle positions.

In two seasons with the Bears, Bass has played in 20 games and started two. In 2013, he returned an interception for a touchdown in a game against the Baltimore Ravens.

The Bears waived 16 players and terminated the contracts of four veterans. Safety Anthony Jefferson was placed on the injured reserve list, and defensive lineman Jeremiah Ratliff was placed on the reserve/suspended list as he sits out the first three games of the season.

Players waived

— LB Jonathan Anderson
— LB David Bass
— CB Qumain Black
— OL Conor Boffeli
— WR A.J. Cruz
— DT Brandon Dunn
— QB Zac Dysert
— CB Jacob Glenn
— WR Rashad Lawrence
— G Tyler Moore
— G Michael Ola
— TE Gannon Sinclair
— WR Ify Umodu
— LB Matthew Wells
— DT Terry Williams
— LB Kyle Woestmann

Contracts terminated
— DE David Carter
— LB Mason Foster
— TE Bear Pascoe
— TE Dante Rosario