Bayern squad showed their quality in second - leg demolition of Porto . But Pep Guardiola 's side still have major vulnerabilities , as first leg showed . Real teams may struggle without Luka scoring , despite easier chances . Juventus ' weakness is reason for hope , but Andrea Pirlo is past his peak . Barcelona 's front ##line is formidable , but they lack sufficient 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 .