5. Bebe
Sir Alex Ferguson signed Bebe from Vitória de Guimarães in 2010 on the advice of former assistant Carlos Queiroz. Ferguson himself had never even heard of Bebe before, let alone seen him play, and only met him the day before his transfer. This is a lesson to all prospective managers to always, always scout a player before taking the plunge with a formal bid, particularly when it's for a reported 9 million. The Portuguese striker simply hasn't fitted in at Old Trafford and has found himself farmed out on loan twice, first to Beikta,
who banished him for breaking a team curfew and sent him packing back to Manchester, and then to Rio Ave, where he today remains. He is due back at Old Trafford at the end of the season but his two career goals for the club suggest he'd be better off staying away.