Manchester City boss Mark Hughes has ruled out Jo signing permanently with Everton.
"The reason I allowed him to go was that I felt he wasn't going to get a chance to play here this season," said Hughes, speaking at a specially arranged lunch on behalf of Premier League sponsors Barclays.
"What the lad needs is Premier League football. I expect him to get better and develop in terms of what is required to play in the Premier League.
"It is much more physical and intense than he is used to, and I think that probably took him aback. He struggled to cope with it.
"Most attack-minded players find it hard to come to the Premier League and hit the ground running. Andrey Arshavin is the same at Arsenal.
"The Premier League is just so much more intense than anywhere else."