Report: Portuguese doctor tells C.Ronaldo playing with knee injury could be career-threatening http://t.co/g33D1fq9tO via @ProSoccerTalk footbaLLove (@footbaLLove)June 19, 2014 Portuguese doctor tells Cristiano Ronaldo playing with knee injury could be career-threatening According to a famous knee surgeon in Portugal, Cristiano Ronaldo risks ripping up his knee every minute he remains on the pitch. http://prosoccertalk.nbcsports.com/2014/06/18/portuguese-doctor-tells-cristiano-ronaldo-playing-with-knee-injury-could-be-career-threatening/