Barcelona conceded four goals at home in a competitive game for the first time since a 4-2 defeat against Deportivo (thanks Opta) in 2003 on Sunday.
Ernesto Valverde’s side are without a La Liga clean sheet since August, have conceded 18 times in 12 games and will have to tighten up if they are to retain their title.
Sergi Roberto had a horrible game, Gerard Pique and Clement Lenglet were not muc better, but the defence also lacked protection and were frequently exposed.
Even Ter Stegen makes mistakes
Marc-Andre ter Stegen has staked a claim to be Europe’s finest goalkeeper in recent seasons, but he made a rare error for Real Betis’ third goal which came at a crucial time.