#5 Bebe
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Only five weeks after signing for Vitoria de Guimaraes, Manchester United agreed an undisclosed fee for Portuguese footballer Bebe amid reported interest from Real Madrid and Benfica. However, little did they know that the attacker would go down as one of the worst players ever to arrive at Old Trafford.
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Bebe's signing came as a surprise after Sir Alex admitted that he had never seen him play, signing him on the recommendation of his former assistant Carlos Queiroz. The Portuguese made only 7 appearances and scored 2 goals for the club from 2010 to 2014, before being loaned out to Besiktas.
As Manchester United realised their horrible mistake, he was sold to Benfica after 3 loan spells.
Edited by Anirudh Menon