METAIRIE, La. -- New Orleans Saints rookie running back Kendre Miller is not expected to miss extensive time after leaving Sunday's preseason game with a knee injury, according to a source.

New Orleans Saints coach Dennis Allen said Miller sprained his knee against the Kansas City Chiefs and was expected to have tests on the knee after the game. A source said the injury is not considered severe and Miller could be on track for the beginning of the regular season.

Allen said the injury was to the right knee, which is the same knee Miller injured during the Fiesta Bowl in December. He did not fully participate in practice until training camp opened because of that injury.

NFL Network first reported that Miller's injury wasn't considered severe.

Miller is currently the No. 3 running back behind Alvin Kamara and Jamaal Williams, although if healthy, he would likely assume the backup position for the first three games of the season. Kamara will not play in those three games while serving a suspension for violating the NFL's personal conduct policy.

The Saints, who hosted Kareem Hunt for a visit last week, will likely look to add running back depth until Miller returns. The only other healthy running back on the roster besides Kamara and Williams is rookie Ellis Merriweather.