Manchester United commercial chief Richard Arnold insists they do not sign players to sell shirts.
"We don't sign players to sell shirts." Arnold said. "We are reliant on 25 players and they are all massive stars. We have 25 George Clooneys.
"When you look at the success we've seen in that part of the world [Asia], it isn't down to any one player or person. Of course, Ji is a fantastic player, was captain of the South Korea team and continues to be a key part of our squad.
"These are huge stars and the big stars are the big stars in every country. Our games are shown 1.1 billion homes across the globe and you think 'which film does that 60 times a year?'
"Be it George Clooney or Brad Pitt, what is there where that is shown? There just isn't anything like it."