#2 Lionel Messi
After the highs experienced in his career between 2009 and 2012, 'La Pulga Atomica' has suffered a bit of a lull (by his extremely high standards) in recent seasons.
He has not won the UCL Golden Boot since 2012, while Ronaldo has overtaken him in the scoring charts in what was once inconceivable owing to the healthy lead Messi had over his rival. The same applies to the Ballon d'Or where they are tied on 5 apiece from a 4-1 advantage to Messi in 2012.
Barcelona have not triumphed in the Champions League since 2015, knocked out in embarrassing fashion in each of the last three editions at the quarter-final stage, with eternal rivals Real Madrid jarringly going on to win each tournament.
Barcelona would seek to reassert their dominance on the continent, and with Lionel Messi leading the charge, don't bet against it happening.