Seems like he is having some issues:
"CB Will Poole, who sat out last year with a knee injury, wore a red jersey which alerts his teammates to avoid hitting him. Poole really seemed to be hobbling."
http://www.sun-sentinel.com/sports/football/pro/dolphins/sfl-camprail04aug04,0,2120557.story?coll=sfla-dolphins-front
"Poole, who is recovering from reconstructive knee surgery, was limping noticeably and favoring the repaired left knee."
http://www.miami.com/mld/miamiherald/sports/football/15192550.htm
"CB Will Poole, who sat out last year with a knee injury, wore a red jersey which alerts his teammates to avoid hitting him. Poole really seemed to be hobbling."
http://www.sun-sentinel.com/sports/football/pro/dolphins/sfl-camprail04aug04,0,2120557.story?coll=sfla-dolphins-front
"Poole, who is recovering from reconstructive knee surgery, was limping noticeably and favoring the repaired left knee."
http://www.miami.com/mld/miamiherald/sports/football/15192550.htm