Barcelona coach Xavi Hernández urged João Félix to use disparaging comments from his former teammates to motivate him against Atlético Madrid on Sunday. João Félix, 24, joined Barça on a season-long loan from Atlético in the summer and will face his parent club for the first time on Sunday at the Olympic Stadium. – Stream LIVE: Barcelona vs. Atletico Madrid, Sunday, 2:50 p.m. ET, ESPN+ Atlético forward Antoine Griezmann said…