Jo spent much of last season on loan with the Toffees and has now agreed to a new season-long loan from Manchester City.
He told the club’s official website: “It would be fantastic. I was really impressed with Jo last year.
“The first time I trained with him I saw unbelievable quality for such a young player – he looked like he had everything in his locker.
“There were question marks before he came here, but I think everyone at Everton appreciated his quality and I think he’s really enjoyed the camaraderie in the team. If you’re happy off the pitch, you’ll be happy on it.
“He scored some important goals for us.”