World number one Novak Djokovic admitted on Sunday that he cannot guarantee he'll start the Monte Carlo Masters as he battles the after effects of an ankle injury. "I can't guarantee 100 per cent that I'll be on court. I have to be realistic and cautious," said the world number one who rolled his right ankle badly a week ago during Serbia's Davis Cup win in the United States. "I've had three days of practice and I've been increasing the level each day. "If I have discomfort over the next two days that would be an indication if I should or should not play." Djokovic, who is based in Monte Carlo and feels a responsibility to compete if possible in his "home" event, said that he will make a final decision by Tuesday. Source: AFP