Sergio Aguero has confessed that he had "a lot of problems" with Manchester City boss Pep Guardiola in the early stages of their shared time together.
The former City striker has since been forced to call time on his illustrious playing career due to heart complications that were discovered shortly after he joined La Liga giants FC Barcelona.
After reporting chest pains during the Blaugrana's 1-1 draw against Alaves last October, Aguero was diagnosed with cardiac arrhythmia and was left with little choice but to retire.
