FC Barcelona's head coach Xavi Hernandez (R) chats with his assistant coach Oscar Hernandez (L) during a training session at Joan Gamper sports city in Barcelona, Catalonia, Spain, 20 December 2021, on the eve of their Spanish LaLiga soccer match against Sevilla FC.   EPA / Alejandro Garcia

Real Madrid lead over Barcelona 'abysmal' but plenty of time to close gap, says Xavi