Thursday night was a special match for John, who visited Fulham on several occasions when brother Collins John played for the club.
"It is fun to be back," he said. "For years I was coming here watching the games and it is just funny to be back now.
"I was just watching the games but now I am playing on the pitch. [Collins] phoned me and asked me 'how was Fulham?' and I said it was still the same. I just tried to play my game and be myself.
"It's good for me because it is a new step to play an English side at this old club, Fulham, so it's nice."
While John only impressed in fits and starts last night, he is highly regarded in Holland and claims some of the Premier League's elite are chasing his signature.
"If you are that good, the opportunity will come again when you are older. Playing in England is my dream, of course.
"You want to play as high as possible so that is my dream.
"Manchester is a beautiful club and Arsenal too."