Rayo Vallecano do not usually beat Barcelona. In fact the humble club from the proudly working class Madrid neighbourhood of Vallecas, with their three-sided stadium and miniscule club shop, had last won a game against the Catalans in January 2002.
But coach Andoni Iraola sensed his side, who had only recently won promotion back to the top flight, stood as good a chance of an upset as ever when they hosted Ronald Koeman's struggling side last month.
'We spoke about it between us because they were missing some fundamental players such as Frenkie de Jong, Ousmane Dembele and Ansu Fati amongst others so it was a great opportunity for us,' Iraola tells Sportsmail.