Pep Guardiola was reportedly very impressed when he had one current Arsenal star in training back in 2014. Having coached Barcelona, Bayern Munich and Manchester City during his managerial career, the Spaniard has trained a significant number of players who have performed in the upper echelons of world football. Now though, some behind-the-scenes details have emerged regarding one player who had one training session with Guardiola and caught the 53-year-old’s eye. Guardiola was stunned by Arsenal player he trained in 2014READ MORE: Man City’s 2023/24 squad cost in full as transfer fees and sta…