#1 Wayne Rooney
Perhaps an obvious number 1, Rooney was pivotal to Ferguson's great Manchester United team from 2006 to 2011. In this time, he was immense in attack as they reached 3 Champions League finals, winning in 2008.
Rooney announced himself on the UEFA Champions League stage in style, scoring a hat-trick against Galatasaray in 2004 aged just 18, making him the youngest player to achieve the feat.
While it's Cristiano Ronaldo who gets the most plaudits for Manchester United's 2008 triumph, it was Rooney's aggressive running and tirelessness beside him that was so effective for his team's success. He still pitched in with 4 goals in 10 games, a decent return.
For 6 seasons from 2006/2007, Rooney scored at least 4 goals in every edition of the competition, a consistently excellent contribution for an attacker. In his 3rd final with the club, it was his strike that equalized against Barcelona at Wembley, only for them to be blown away by Pep Guardiola's side in 3-1 in the second half.
Rooney joined Everton last summer and it's likely that he'll never return to UEFA Champions League action, but the Englishman can take pride in his record tally of 30 goals from 85 appearances, and Harry Kane will undoubtedly have his work cut out to surpass the Manchester United legend.