#3 Ryan Giggs
Ryan Giggs could not have missed this list. The Welshman was an influential and senior figure at the training ground and the dressing room for the majority of his career.
Being a part of Fergie's Fledglings and the Manchester United senior team simultaneously, Giggs helped Sir Alex make the most of his talent on youth and senior fronts.
Manchester United's downfall during the Moyes era saw Giggs being appointed as the interim player-manager of the team. He handled the club decently until a new manager was appointed in the form of Louis van Gaal.
The Welshman was a versatile player who proved useful for Ferguson anywhere in the final third. At the age of 41, Giggs was still running up and down the flanks for the Red Devils.
After announcing his retirement in 2014, the Manchester United legend was lauded for his dedication, club loyalty and longevity. A prominent member of the iconic Class of '92, Giggs remains one of the best players under Fergie.
#2 Wayne Rooney
Wayne Rooney aka Wazza, as lovingly called by his fans, touched the sky during his stint with Manchester United's all-time greatest manager, Sir Alex Ferguson.
After a scintillating tenure with Everton, Rooney was hot property during the 2004 summer transfer window. He was roped-in by Manchester United for an initial £20 million deal. The deal meant it was the highest ever price paid for an 18-year-old.
He became the club's leading goal scorer and grabbed the PFA Young Player of the Year award in the first year itself. As time passed, Rooney evolved himself into a goal machine and ended up as Manchester United's all-time top goal scorer across all competitions.
Credit for the same goes to Alex Ferguson, who molded Rooney into the player he turned out to be. Fergie was also successful in creating a lethal duo that involved Rooney and a certain player. More about him below.
#1 Cristiano Ronaldo
The Manchester United players happened to receive a special warning ahead of their friendly outing to Sporting CP in 2003. The warning was regarding Sporting Lisbon's number 28.
United lost the match 3-0 but they sealed victory by signing their number 28 immediately. That player happened to be none other than Cristiano Ronaldo!
Ronaldo, who considers Alex Ferguson a father figure, credits all his success to the Scottish manager. Fergie helped Cristiano Ronaldo shape his style of play and mentality. Under the watchful eye of Ferguson, the Portuguese forward conquered England within a short span of time.
He re-invented the number 7 shirt that no one could grace till date but himself. Cristiano left Manchester United for Real Madrid in 2009 with the intention of stepping-up in his career. Ronaldo maintained close contact with Sir Alex and was greatly influenced by his former boss for a comeback that happened this season.