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Group B will be defined by the battles between Real Madrid and Juventus. Real Madrid have one of the best attacking teams in Europe and Juve have one of the most formidable back lines.
Antonio Conte's three-man defence consists of a trio of world-class defenders, Barzagli, Chiellini and Bonucci.
In 2012/13, Barzagli started 34 Serie A games for Conte's side and played a massive role in Juve winning their second Scudetto in as many years—keeping 19 clean sheets along the way.
In the Champions League last season, Juve managed to keep five clean sheets in a row as they swept past the likes of FC Nordsjaelland, Chelsea, Shakhtar Donetsk and Celtic.
This season they will be a dominant force again in Europe and could even be dark horses to win the competition.
Barzagli edges out Chiellini in my opinion for his composure, perfectly-timed tackles, strength and sheer determination. This is a player who was signed from Wolfsburg in 2011 for £264,000 and has gone on to establish himself as one of the standout defenders in Serie A.
If you aren't familiar with Barzagli's game, watch as Gareth Bale, Cristiano Ronaldo, Isco and co attempt to run rings around Juventus in this season's Champions League. Chances are, you won't forget him.