As Sir Alex Ferguson's assistant manager at Manchester United, Carlos Queiroz had success in two spells at the club, but failed as a manager in his own right.
Queiroz, 61, first arrived at Old Trafford back in 2002, coming in as a replacement for Steve McClaren as Ferguson's right hand man.
After earning plaudits alongside Ferguson, Quieroz was hired by Real Madrid in 2003, but lasted just one season before being sacked and returning to United.
Queiroz stayed until 2008, when he returned to the role of Portugal manager - 15 years after his first spell in charge of the country.
His knowledge of Portuguese talent has long been cited at Manchester United, hence the arrivals of Cristiano Ronaldo and Nani, and whilst both enjoyed varying success at Old Trafford, another alleged Queiroz signing didn't go quite so well.
In 2010, United bizarrely paid £7.4m to land winger Bebe from Portuguese side Vitoria de Guimaraes, but after just seven appearances for the Red Devils, he was sold to Benfica this summer.
Quieroz was widely credited with being the person that recommended Bebe to Ferguson, but in this month's issue of FourFourTwo, he strongly denies that claim, saying he wasn't even aware of the player's existence.
"Bebe was not even part of our scouting files for the national team of Portugal," said Quieroz. "He didn't exist, in a system where nothing escaped us. So Bebe going to Man United took me by surprise. I called my coaches and asked them what was going on, why he didn't exist. I knew nothing about him."