The recovery from the surgery, which was done by Dr. William Meyers at Jefferson at the Navy Yard in Philadelphia, is expected to keep Clayton out at least until training camp and maybe beyond.
Clayton saw action in 14 games last season, mostly in the Eagles' nickel packages and as a key contributor on special teams. He finished the season with 31 tackles and two passes defensed.
The Eagles added rookie Mychal Kendricks in the 2012 NFL Draft, so their linebacking corpse is a bit more crowded than it was last season. With that and the injury setback, Clayton could be on the outside of the linebacker rotation looking in when training camp arrives in July.