The Spaniard had been voted Player of the Year in his first two seasons at Stamford Bridge, but failed to hold down a regular place in the side during his third campaign in west London.
Despite that, Juan was initially keen to stay at Chelsea when United came calling in 2013/14, but the allure of being a Red was something he simply couldn't turn down.
“The summer before, there was some interest [from United],”
the 31-year-old said during his appearance in the latest episode of the UTD Podcast.
“No [I wouldn’t leave then].