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ac milan striker ronaldo has conceded he may be forced to retire by a second serious knee injury. the 31-year-old told brazilian tv over the weekend he is prepared for the worst - after holding his first press conference since undergoing surgery in paris. ronaldo suffered a ruptured tendon in a 1-1 draw against livorno on 13th february - the same injury that sidelined the three-time fifa player of the year for 20 months in 1999. soundbite (portuguese) "my will is to keep on playing. my heart tells me this, but my body is showing me signs that it is tired, that it is asking for rest. in this next period, i will be recovering physically, but i intend to lead a normal life. if i feel as though my body is able, i will return to playing football." supercaption: ronaldo, ac milan soundbite (portuguese) "my motivation is the same as it was then. there's always this love for football, the passion for the sport and the desire to score goals, and that is the light at the end of the tunnel, but it won't be easy. i'm hoping that this time there won't be the delays that i experienced last time. the first injury was a completely new experience, but now i can stand on the shoulders of that." supercaption: ronaldo, ac milan ronaldo's surgeons say it will be three months before a possible comeback can be envisaged, perhaps with flamengo - the brazilian side say they'd be keen to sign the player. full rehabilitation, though, is expected to take at least nine months.