#1 Park Ji-Sung
Despite having a huge success at Manchester United over the course of his seven-year spell, he never received the acclaim he warranted. He played an important role in much of the club's success in those years and ironically, his praises remain relatively unsung.
The South Korean midfielder had a fantastic defensive work-rate that has been matched by few, and Sir Alex Ferguson showed great faith in him, often starting him in some important games - including the 2009 Champions League final loss against Barcelona.
Strangely he would often be left out of the starting lineup in the less important games but was always ready when called upon, and didn't let his bit-part role affect his fantastic attitude, leading to him scoring some significant goals.
Park was rarely considered more than a fringe player during his seven-year stay at Old Trafford, but Ferguson regularly called upon him in important, season-defining matches.
Surprisingly, he was dropped by Sir Alex in the 2008 Champions league final. Though the team won, his absence was significant. He later revealed that he regrets dropping him during that finale against Chelsea.
His work-rate as a player was above the charts and his fantastic energy on the pitch earned him the nickname of 'three-lung Park'.