text: Guardiola was Messi's mentor from 2008 to 2012, winning two Champions League titles in 2009 and 2011?
classes:  No, messi and Guardiola had never worked together before.  Besides, messi and Guardiola had never worked together before.  Yes, messi and Guardiola had never worked together before.  Meanwhile, messi and Guardiola had never worked together before.