John Guidetti played for Manchester City between the years of 2010 and 2015 without making a single appearance for the Citizens. The Sweden international was sent on five loan spells, at the likes of Celtic, Burnley and Feyenoord. The most goals he has scored for a club is the 20 he hit in the 2011/12 season at the Dutch side, and it looked as if City might have a decent youngster on their hands.
However, nearly a decade later, the 28-year-old currently plies his trade in Spain with Deportivo Alaves and has recently comeback following an unsuccessful loan spell at Bundesliga 2 outfit Hannover 96. It really hasn't worked out as planned, in truth.