Travis Long tore the anterior cruciate ligament in his left knee one year after suffering the same injury, ending the season for the Eagles outside linebacker.
Long was hurt Monday during practice. If the Eagles want to open a roster spot, they would need to waive Long as injured and he would revert to injured reserve if he goes unclaimed. If they put him directly on injured reserve, he would count against the 90-man roster.
The Eagles were already light at outside linebacker. They released veteran Trent Cole and re-signed Brandon Graham in March, but the only other free agent they added was combo linebacker Brad Jones.