Are Barcelona enduring a mini crisis this season under Xavi?

Club legend Xavi's inaugural managerial voyage at Barcelona has resurrected the Blaugara from financial capitulation on the field in recent seasons. Last season he delivered the La Liga title and Spanish SuperCopa, as he guided the club back to silverware after a turbulent last two seasons prior. However, a U-turn in form this December has sparked newfound scepticism surrounding the club and has jeopardised a defence of the league title.