Cape Town - Manchester City have been handed a blow with the news that Bacary Sagna will be sidelined for three weeks, while Sergio Aguero has declared himself fit.The 33-year-old Sagna tore a hamstring during France's 4-1 World Cup qualifying win over Bulgaria on Friday.He is now expected to miss City's next four games including a Premier League match with Everton, two Champions League clashes against Barcelona and an EFL Cup tie against Manchester United.This is the second time the former Arsenal defender has been injured already this season after he missed almost a month at the start of the campaign with a similar hamstring problem.There is some good news on the injury front however, after Aguero claims he is fit and ready to go despite needing to be withdrawn from Argentina's 2-2 draw with Peru on Thursday after 73 minutes with a calf strain.An upbeat Aguero told Diario Ole: "I'm quite well now, you get physical fitness playing, not training. (Argentina boss Edgardo) Bauza has the decision - I'll be available for Tuesday. I'm much better."After the Peru game I had two days to make the recovery and I did a little bit of football today. I'm quite well."