Manchester City executive chairman Garry Cook admits he's to blame for the drawn-out deal for CSKA Moscow striker Jo.

He told the Manchester Evening News: "I think I need to take some sort of responsibility for that.

"Being new to transfers and the Premier League and the Football Association regulations, I had to carry out my own due diligence on behalf of the club.

"These signings are very, very complex. We were signing a Brazilian from a Russian club.

"I contacted the Premier League and the FA and I slowed everything down until I felt we were all doing the right thing.

"It was really me and my naivety that slowed it down more than anything else, but I thought it was the right thing to do for the club.

"It turned out that the result was equally exciting, in as much as we got one of the great future players in world football playing at Manchester City."