#2 Barcelona
Player to watch - Lionel Messi

Barcelona became arguably the best club team in history following their exploits between 2008 and 2012, where they won 14 out of 18 trophies available to them, including an unprecedented six trophies in 2009, but they have fallen some way off those lofty heights (even though a second treble was won in 2015).
They have massively faltered on the continent in recent years, failing to get past the quarter-final stage in each of the last three seasons, with last term's elimination to AS Roma being the nadir.
To make matters unbearable, each of the last three editions of the UCL has been won by arch rivals Real Madrid and the Blaugrana are desperate to get their hands back on the 'Big Ears'.
Though the team might have undergone some massive overhaul from those golden years under Guardiola, one man still remains - Lionel Messi, who despite his UCL struggles in recent seasons remains one of the greatest ever to grace a football field.
The Barcelona talisman stated at the start of the season that he is eager to lead Barcelona to Champions League glory and his performances so far this campaign suggests that he is on a one-man mission to fulfil his quest and with Messi in beast mode, there just might be no stopping the Catalans.