7. Cristiano Ronaldo

Cristiano Ronaldo has exhausted all superlatives, except to say that having developed and matured from an inexperienced, young winger when he left Sporting Lisbon in 2003, he's now the best footballer on the planet.

The story goes that Sir Alex was persuaded to buy Ronaldo - largely unknown when he signed as an 18-year-old for £12.24m in 2003 - by his players on the plane home from a pre-season friendly against Sporting. In truth, the boss had long been aware of his ability. The urgency stemmed from other clubs’ increasing interest. This was a target Sir Alex simply could not miss out on.

Ronaldo wasted little time in showing off his sublime skills with a stunning 30-minute debut against Bolton at OT in August 2003. There was a buzz of excitement as soon as he stepped off the bench and, after 39 appearances and eight goals that season – including the opener in the 3-0 FA Cup final win over Millwall – he was named Sir Matt Busby Player of the Year.

His second term didn’t quite live up to his first, but late season form saw him end 2004/05 with nine goals in 50 appearances. In 2005/06 Ronny again reserved his best form for the latter stages, but the inconsistencies of a developing young player were being ironed out. He departed, full of hope and with great expectations, for the 2006 World Cup finals in Germany - what turned out to be a truly defining moment in his career. In the quarter finals, Portugal met England and, after Wayne Rooney’s sending off, Ronaldo became the pantomime villain for the English press. Some doubted he would return to Manchester. But Sir Alex assured him any ill-feeling would blow over. It’d happened with Eric Cantona and David Beckham. Ronaldo met the inevitable boos with the best football of his life.

United’s title success in 2006/2007 was a team effort, but one man took the lead role in every

major plotline. It began with the barnstorming 5-1 win over Fulham – Ronaldo and Rooney ran the show and publicly banished claims they were at odds. Dazzling wing-play was backed with regular assists and crucial goals. His form that season brought a glut of individual accolades and, despite interest from other clubs - notably Real Madrid - he extended his contract until 2012.

Ronaldo improved further in 2007/08, netting a staggering 42 goals in all competitions. In May 2008 he fired United to domestic and European glory; scoring a decisive penalty on the final day of the league campaign and a powerful header in the Champions League final in Moscow. His staggering individual performances gleaned a clean sweep of club and domestic individual honours, with global gongs soon to follow.

At Euro 2008, Ronaldo’s future was again the subject of claim and counter-claim. Happily, in the end, he pledged his allegiance to United, although ankle surgery delayed his start to the 2008/09 campaign. He made his return as a substitute against Villarreal in the Champions League and was given a rousing home reception. Two months later, his 100th Reds goal arrived against Stoke City at OT on 15 November 2008.

Ronaldo’s magical 2008 was rounded off with another string of individual honours. In October he was named FIFPro Player of the Year, and in December became the first United player since George Best in 1968 to be awarded the prestigious Ballon d’Or trophy. To cap it off, in January 2009, he became the first Red to win the FIFA World Player of the Year award. "This is the climax of a fantastic era," he said at the ceremony in Zurich. "I'm lucky to be part of United's history. It's one of the most important moments of my life, I hope to be back in this position again."