#1 Cristiano Ronaldo
Diego Simeone often likes to criticize Cristiano Ronaldo in public, which is something natural between arch-rivals. However, no sane person can deny that the Portuguese is one of the most decisive players in the world, in the past few years.
In the Liga derby at the Calderon last season, Cristiano Ronaldo scored a hat-trick to silence all his critics and to remind Atlético fans that in Madrid, there is only one boss. In addition to that, Cristiano went on to score yet another hat-trick against Atléti, in the semi-final of the UEFA Champions League. Real Madrid would eventually win the tournament, and be crowned as the champions of Europe for a record 12th time.
In brief, Cristiano Ronaldo has very often slain Atlético Madrid. His dip in form in the league, in the past two months, does not change the fact that he is still one of the best goalscorers in the world, if not the best. He is, by the way, the leading goalscorer of the Champions League with 6 goals in 4 matches already.
Meanwhile, Atlético Madrid have some serious goal-scoring issues, having just scored 19 goals in 16 games, in all competitions this season. They are in desperate need of a clinical force in attack. In other words, they are in desperate need of someone like Cristiano Ronaldo.