LONDON - Manchester City’s top scorer Sergio Aguero is ready to make his return from injury against Cardiff City on Saturday and could even feature in the FA Cup replay against Blackburn Rovers on Wednesday, the Argentine said.Aguero has not played since limping off the field with a calf injury during the 6-3 victory over English Premier League title rivals Arsenal on December 14.  "I’ll be ready for action this week,” the Argentine said in a post on his official website on Sunday."My injury is improving slowly. Recovery’s going very well. I’m back to sprinting on the field and moving the ball around.Aguero has struck 13 goals in 15 league appearances this season and his injury was considered a big blow to the team’s title hopes.However, Spain’s Alvaro Negredo and Bosnian Edin Dzeko have stepped up with goals in his absence as City recorded seven wins in eight league and cup matches since to move top of the table.With important league fixtures against Tottenham Hotspur and Chelsea and a Champions League tie with Barcelona on the horizon manager Manuel Pellegrini may opt for caution on Aguero’s return date.