Portis carried the ball once for three yards before exiting the game in the first quarter. He limped along the sideline after leaving the field.
Portis, 28, is one of multiple Redskins who are nursing injuries. Donovan McNabb missed the Jets game with an sprained ankle, fullback Mike Sellers sat out with a tweaked knee, and wide receivers Devin Thomas and Malcolm Kelly missed the game because of minor ailments.
Portis, a two-time Pro Bowl pick, is guaranteed $6.4 million of his $7.2 million base salary in 2010, and the team would like to see him return to form after he rushed for just 494 yards and one touchdown in eight games in 2009. His season was cut short because of concussion issues.
Portis led the Redskins with 1,487 yards and nine touchdowns in 2008, and he has 9,696 yards and 73 touchdowns in his eight-year NFL career.