JACKSONVILLE, Fla. (AP) - Jacksonville Jaguars running back Greg Jones is out for the season after tearing a ligament in his left knee. The team's starting fullback and Fred Taylor's primary backup was injured during Saturday's preseason game against Tampa Bay. Coach Jack Del Rio initially said it was a sprained medial collateral ligament, but tests revealed a torn anterior cruciate ligament. Jones, a former WTOC Super 11 All-Star and Player of the Week, sustained a similar injury to his right knee during his final season at Florida State and dropped to the second round in the 2004 N-F-L draft. He ran 62 times for 162 yards and three touchdowns as a rookie. Last season he carried 151 times for 575 yards and four scores. The Jaguars had planned to platoon the oft-injured Taylor and Jones this season, using the six-foot-one, 250-pound Jones in short-yardage situations and near the goal line. Now, Derrick Wimbush moves into the starting fullback spot and LaBrandon Toefield becomes Taylor's main backup.