Sir Alex Ferguson’s 26-year reign as manager of Manchester United saw him win two Champions Leagues and 13 Premier League titles, among a vast number of other trophies.

Next to the success, what Ferguson will be remembered for in years to come is the quality of players that he managed, including some of the best that the Premier League and the world have ever seen.

The list included Ballon d’Or winners like Cristiano Ronaldo and Michael Owen, as well as world-regarded midfielders like Paul Scholes and Roy Keane.

However, the downside of managing such a plethora of star players is that some unsung heroes end up receiving less attention than they deserve.

Park could have been Man Utd difference in 2011 Champions League final

In an interview with Gary Neville, Ferguson was asked about some of the most underrated players he coached, and one he highlighted in particular was Park Ji-Sung. The South Korean star joined United in 2005 and won four Premier Leagues, three League Cups and one Champions League before leaving for QPR in 2012.

Ferguson's comments related to his regret about not properly utilising Park in the 2011 Champions League final against Barcelona at Wembley.

Alongside Park, Ferguson named Brian McClaire and Ronny Jonsen as the most underrated players he managed, who were both also instrumental in numerous trophies that Ferguson won with United.

Loved by his teammates as well as the boss

Nicknamed “Three-Lung Park” by some of the Old Trafford faithful, the South Korea star made 205 appearances for Manchester United and registered 27 goals and 28 assists.

His work ethic not only earned his managers' admiration but also his fellow teammates. Park and Patrice Evra have a close friendship, and the left-back has previously shared that he doesn’t think that Park gets enough credit and that he was a “soldier” who put in “man-of-the-match” worthy performances against Barcelona in both legs of the 2008 Champions League semi-final.

Wayne Rooney and Rio Ferdinand have both praised Park as a team-first kind of player. Ferdinand said of Park, “you wanted him in your team,” and Rooney praised him further, saying:

“All of us who played with Park know he was almost as important to our success. That’s because of what Park gave to the collective.”

While Park doesn’t receive the praise some of his United compatriots receive, those fans who watched him, those teammates who played with him, and most of all, Sir Alex Ferguson all know the effort and quality he brought to United during his time there.