Manchester City superstar Sergio Aguero is facing Champions League heartbreak.The Argentine ace was hoping to prove his fitness ahead of City's crunch quarter final showdown with Lyon in Lisbon on Saturday - but is set to miss out.Pep Guardiola is also expecting to be without his leading striker for the semi-finals and final should City make it that far.The news is a huge blow to Aguero, who is approaching the twilight of his career with City and knows this could be his last chance to win the one trophy that has eluded him at the Etihad.The 32-year-old has been sidelined since June after damaging knee ligaments in a 5-0 home win over Burnley.He travelled to Barcelona to see renowned specialist Ramon Cugat and has been continuing his.
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