La Liga leaders Barcelona fell to a 1-0 defeat at Real Sociedad on Sunday night as they had a Robert Lewandowski goal controversially disallowed, with coach Hansi Flick labelling the decision a “big mistake”. 

Sheraldo Becker’s 33rd-minute goal consigned Barcelona to their second league defeat of the season, leaving the Catalan giants six points clear of second-placed Real Madrid, having played an extra match. Lewandowski’s early disallowed strike led to furious debate over whether the Polish forward was offside or no.