#3 Xavi
Xavi was very similar to Iniesta in terms of his playstyle, and the pair had superb chemistry in the heart of the midfield for Barcelona. They became a formidable duo for much of the noughties, especially during the tiki-taka era of play.
Xavi had been inducted into the first team four years prior to Iniesta, though, making his debut against Mallorca in 1998. At the time he was just viewed as another hot young prospect from La Masia, but nobody could ever have predicted just how important he would become to the team.
By the end of his time with Barcelona, he had played in over 700 games, which is still a club record, and scored 85 goals in the process. He is also the first player in Barca's history to have featured in 150 European and Club World Cup matches.
Xavi retired from international football after the 2014 World Cup, but still plays professionally; he is currently a midfielder for Al Sadd in Qatar.