#3 Dani Alves
Dani Alves, during his stints at Barcelona, Juventus and Paris Saint-Germain had made himself a name as one of the best right-backs to have played the game.
The most decorated player in the sport, in terms of trophies, Alves joined Brazilian club Sao Paulo in 2019, and was given the no.10 shirt.
And no, this was not like Arsenal giving William Gallas the no.10 shirt despite him being a centre-back.
Dani Alves actually reinvented himself to play in an attacking midfield role for the Brazilian club, and is showing no signs of stopping soon.
However, the Brazilian veteran is no stranger to moving out of his position. He's even kept goal in his career, when he went in between the sticks for PSG in a game against Sochaux
#2 Gareth Bale
Bale was a burgeoning left-back at the Southampton academy, before he joined Tottenham Hotspur. He had a stop-start career to his Spurs career as well, and never really nailed down a spot in the team as a left-back.
Bale was lurking around the fringes of the first-team, when Harry Redknapp decided to use the Welshman's qualities in an advanced role, where he absolutely flourished, and eventually became a world-class player.
In fact, in 2012-2013 season, Bale was adjudged the PFA Player of the Year for an outstanding season with Spurs, that eventually earned him his move to Real Madrid.
Eventually, things did turn sour for the Welshman at Real, but he did have a career filled with iconic moments for Los Blancos.
A brace in a UEFA Champions League final to complete a threepeat, that iconic goal against Barcelona in the Copa Del Rey final - Bale did produce his fair share of electric moments for Real Madrid fans to remember.
#1 Sergio Ramos
Even as late as the 2010 FIFA World Cup, Ramos was a right-back for Spain. However, what he has developed into after that is beyond even the wildest imagination.
For the adventurous full-back from then to develop into a leader, and solid rock at the heart of the Real Madrid defence, has been monumental progress from Ramos.
Real Madrid feel their captain's absence when he has been missing, which is telling of the impact that he does have on them when he is playing.
Ramos captained Real Madrid to three straight UEFA Champions League titles, and has been one of the greatest contributors to the club's recent success under Zinedine Zidane - in a role that he might possibly not have imagined when he made the move to the Bernabeu from Sevilla.