I only had four world class players at Manchester United,says Sir Alex Ferguson

Sir Alex Ferguson has claimed only four of his Manchester United players could be truly regarded as 'world-class'.
Ferguson confirmed Cristiano Ronaldo as the greatest player he worked with at Old Trafford.
He also put Eric Cantona, Ryan Giggs and Paul Scholes among the elite, as he reflected on his career in his new book 'Leading'.
Ferguson said: 'If you read the papers or listen to the television commentators, we seem to be awash with 'world-class' footballers.
'In my book there are only two world-class players playing today: Lionel Messi and Cristiano Ronaldo.
'I don't mean to demean or criticise any of the great or very good footballers who played for me during my 26-year career at United, but there were only four who were world class: Cantona, Giggs, Ronaldo and Scholes.
'And of the four Cristiano was like an ornament on the top of a Christmas tree.'
Ferguson signed Ronaldo as a teenager for £12.25million from Sporting Lisbon in 2003 and reluctantly sold him to Real Madrid for £80m six years later.
FERGUSON'S 'WORLD CLASS' QUARTET WHILE AT MANCHESTER UNITED
RONALDO AT UNITED
Signed: July 2003
Appearances: 292
Goals: 118
Honours: Premier League x3, FA Cup, League Cup x2, Champions League, Club World Cup, Ballon d'Or
Sold: July 2009
SCHOLES AT UNITED
Debut: September 1994
Appearances: 718
Goals: 155
Honours: Premier League x11, FA Cup x3, League Cup x2, Champions League x2, Intercontinental Cup, Club World Cup
Retired: May 2013
CANTONA AT UNITED
Signed: November 1992
Appearances: 185
Goals: 81
Honours: Premier League x4, FA Cup x2
Retired: May 1997

GIGGS AT UNITED
Debut: March 1991
Appearances: 963
Goals: 168
Honours: Premier League x13, FA Cup x4, League Cup x3, Champions League x2, Super Cup, Intercontinental Cup, Club World Cup
Retired: May 2014
Sir Alex was speaking at the start of a tour to launch his new book
Ferguson's new book, Leading, is about management
Sir Alex was speaking at Royal Festival Hall in London as he kicked off a tour to launch his new book, Leading
Ronaldo 'was like an ornament on the top of a Christmas tree,' says Ferguson of his former star forward
There was no place in the very top bracket for England stars like Wayne Rooney, David Beckham or Rio Ferdinand.
Ferguson spoke at the Royal Festival Hall on Monday night on the first of four theatre dates to accompany the release of his book, co-written with successful businessman Sir Michael Moritz, and he paid tribute to another tier of his United players.
'There were big influences like Bryan Robson, Roy Keane and Steve Bruce,' said Ferguson. 'They were not the type of have egos. They weren't the best footballers but they had wonderful desire and made sure they were the best players.'