Published: Aug 15, 2012 1:32 PM EDT
Updated: Aug 16, 2012 6:31 AM EDT

JACKSONVILLE, Fla. (AP) - The Jacksonville Jaguars could be without starting left tackle Eugene Monroe for Friday's preseason game at New Orleans.

Monroe left the practice field on a cart Wednesday after getting hit in the head during drills. Team doctors were checking him for a possible concussion, and coach Mike Mularkey says the results will determine whether Monroe plays against the Saints.

Losing Monroe would be the latest setback for an already shuffled offensive line.

Guard Will Rackley missed the preseason opener because of a high-ankle sprain, is still wearing a walking boot and will be sidelined at least another week. Backup guard Jason Spitz is out at least a month with a foot injury, and reserve center is John Estes is likely out for the season with a knee injury.