Cannon, Dowling remain limited

FOXBOROUGH, Mass. -- Offensive lineman Marcus Cannon, cornerback Ras-I Dowling and defensive end Justin Francis were among those Patriots limited at practice on Tuesday, as they worked with a member of the team's strength and conditioning staff on a side field during the early portion of the session.

Tight end Daniel Fells and wide receivers Kamar Aiken and Mark Harrison (non-football injury list) were also spotted on the separate field, an indication that they might not be available for Thursday's third preseason game in Detroit.

Five players were not spotted at practice, including wide receiver Danny Amendola, tight end Rob Gronkowski (physically unable to perform list), defensive linemen Jermaine Cunningham and Armond Armstead and rookie cornerback Brandon Jones.

The practice is slated to focus on situational work, according to head coach Bill Belichick, who drew a comparison between it and a normal regular season Friday practice.