Jacksonville Jaguars left tackle Luke Joeckel was carted off the field in the first quarter of Sunday's game against the St. Louis Rams.
Joeckel, the No. 2 overall pick in this year's draft, went down while blocking for running back Maurice Jones-Drew. He apparently injured his right leg.
Joeckel was taken to the locker room for X-rays. The Jaguars announced he will not return.
The rookie started the season at right tackle, but moved to the left side after the Jaguars traded away Eugene Monroe last week.
The Jaguars only have Austin Pasztor and Cameron Bradfield at tackle.