Sergio Aguero has discussed the heart problem which forced his retirement late last year, saying the chip used to monitor his condition makes him feel “like Ironman”. Having experienced discomfort in his chest during Barcelona’s 1-1 draw against Alaves in October, Aguero was diagnosed with a cardiac arrhythmia – or irregular heartbeat – and forced to announce his early retirement in December. He was limited to only six appearances for the Blaugrana, having made what he described as a “dream” move in the summer after a decade at Manchester City.