5 players Sir Alex Ferguson should not have sold
#4 Gerard Pique
When you have Nemanja Vidic and Rio Ferdinand playing at the back, there is no way a 21-year-old center-back could break that partnership, no matter how good he plays.
This was the story of Gerard Pique at Manchester United. He was one of the most exciting young defenders in the Premier League when he made his United debut in 2004.
He made his full debut for United in 2006 but was never able to break into the first team on a consistent basis. He finally moved from United to his boyhood club Barcelona in 2008 and went on to become one of the best centre-backs in the world.
He is an integral part of the Barcelona team that has lifted 6 La Liga and 3 UEFA Champions League titles.
He also won the FIFA World Cup with Spain in 2010 and the European Championship in 2012.
Pique's Old Trafford exit was his choice and not anyone's mistake but still, many United fans regret selling him.