The Manchester United boss became embroiled in a bitter feud with then Barcelona manager Pep Guardiola during his three-year spell at the Bernabeu, which overshadowed his league win in 2011/12.
The Manchester United boss became embroiled in a bitter feud with then Barcelona manager Pep Guardiola during his three-year spell at the Bernabeu, which overshadowed his league win in 2011/12.
