Bayern Munich dmonstrated their quality in second-leg demolition of Porto . But Pep Guardiola 's side still have major vulnerabilities , as first leg showed . The most obvious is the lack of a true holding midfielder and defensive midfielder. Juventus ' defence is reason for hope , but Andrea Pirlo is past his peak . Barcelona 's front three is formidable , but they lack required depth .
Bayern Munich dmonstrated their quality in second-leg demolition of Porto . But Pep Guardiola 's side still have major vulnerabilities , as first leg showed . Real Madrid may struggle without Luka Modric , despite easier draw . Juventus ' defence is reason for hope , but Andrea Pirlo is past his peak . Barcelona 's front three is formidable , but they lack required depth .