Smith's left foot was stepped on Wednesday during a pass-protection drill. He went for tests that detected a broken bone in the foot -- the same one that he broke last season as a rookie.
Smith and Roland have shared time at right tackle the last two seasons. Roland, a former college free agent, started 12 games last season. He also was the starter this year while Smith, a first-round draft pick (No. 6 overall) in 2009, got into shape.
The Bengals re-signed defensive back Rico Murray from the practice squad Saturday to take Smith's roster spot.
The Associated Press contributed to this report.