Lewis, who is New Orleans' No. 1 cornerback, played briefly in the Saints' preseason loss to the Houston Texans on Sunday. He missed Tuesday's practice with the injury.
The Pittsburgh Steelers selected Lewis, 29, in the third round of the 2009 draft.
In six NFL seasons, Lewis has 207 tackles, seven interceptions, 51 pass deflections and three forced fumbles.
- Kayla Lombardo