Manchester United are often hailed for having a great youth academy that produces some fantastic players, but it hasn't all quite gone to plan over the last couple of years.
Adnan Januzaj is the latest player to burst onto the scene at Old Trafford but the club were warned that they could lose him if they do not tie him up to a new deal - letting the young forward leave would be a major mistake by David Moyes, but it wouldn't be the first.
Here are five previous Manchester United academy mistakes:
1. Gerard Piqué
Joined Manchester United aged 16 and spent four years at the club, playing just 12 games and sandwiching in a loan spell at Real Zaragoza before returning to Barcelona. He has since played 146 games for the Spanish giants, scoring 10 goals, as well as making his Spain debut just a year after leaving Manchester United, and also playing an integral role in Spain's wins at the 2010 World Cup and also the 2012 UEFA Euro Championship.
Bad Sale Rating 10/10
2. Giuseppe Rossi
Also joined Manchester United at the age of 16 from Italian side Parma. He spent three years with United, playing five games and scoring a superb long-range effort against Sunderland at the Stadium of Light. Spent three months on loan at Newcastle, playing 11 games and was also loaned back to former club Parma, playing 19 games and scoring one goal. Sold in 2007 to Villarreal for a reported fee of £6.6million. He impressed at the club scoring 54 goals in 136 games. Earned him a move to Italian club Fiorentina for €10million, where he has scored five in eight already at the club.
Bad Sale Rating 8/10
3. Ravel Morrison
Joined United aged 16 in 2009, never played a league game for the club and played just three League Cup games. Represented England at U16, U17 and U18 level whilst at United. Released to West Ham and spent last season at Birmingham on loan. Has scored two in six in the league already this season and has earned a call-up to the England U21 side.
Bad Sale Rating 8/10
4. Paul Pogba
Joined the United academy from Le Havre in 2011. Just a year and three games later leaves to Italian giants Juventus. Has impressed greatly at the club, playing 34 games and scoring six goals. He has since made his France debut, and has now played three games and scored one goal for France.
Bad Sale Rating 7/10
5. Robbie Brady
Joined United in 2008 and made his only appearance for Manchester United on 26 September 2012, coming on as an 86th-minute substitute for Alexander Büttner in a 2–1 victory over Newcastle United in the Football League Cup third round. Spent the 2011-2012 and half of the 2012-2013 season at Hull City. Signed for Hull permanently in January 2013 and was integral in securing their promotion to the Premier League for the second time in their history. Has scored three in six at the start of the new Premier League season and has since earned a call-up to the Republic of Ireland side, playing six games and scoring on his debut as well as setting up two goals in a friendly against Oman.
Bad Sale Rating 6/10
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