In addition to losing backup quarterback Colt McCoy to a broken fibula, Washington's guard Jonathan Cooper will miss time with a torn biceps tendon. Cooper left the game in the first quarter and Luke Bowanko, a backup guard, subbed in.

Washington fell to 6-6 with their 28-13 loss to the Philadelphia Eagles. Both teams now trail the Dallas Cowboys by a game for the division lead.

According to the American Academy of Orthopedic Surgeons, injuries to the biceps tendon at the elbow usually occur when the elbow is forced straight against resistance. Surgery to reattach the tendon to the bone is necessary to regain full arm strength and function. When the tendon is reattached to the bone, healing takes about three months. Patients should not lift anything heavy for about six weeks after surgery. Manual labor, sports, and other physical activities that involve your arm may be limited for another six weeks.

With four weeks left in the regular season, Cooper's season is likely done. Pro Football Focus ranks Cooper as “good” in both run and pass blocking. His absence will certainly not make life for third-string quarterback Mark Sanchez, or whoever gets the starting job next week, any easier.

While they lost, running back Adrian Peterson didn't seem to have any trouble behind their dilapidated line. Peterson ran for a 90-yard touchdown shortly after Cooper's exit.

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However, receiving back Chris Thompson also returned to the line up after missing six of their last seven games. Thompson may be in line for more touches in space if head coach Jay Gruden doesn't feel comfortable running behind their line.

Washington hosts the New York Giants next week.