By Ewan Murray Barcelona face Real Sociedad in La Liga on Monday night as they aim to bounce back from a poor run of form. The Catalan giants have lost three of their last four matches, conceding 13 goals in the process, and were beaten 4-2 by Girona last time out. Barca were leading until the 65th minute but conceded three goals in the space of nine minutes to throw away the victory, seeing them drop to third in the table as a result. Real Sociedad are currently sixth and scrapping to secure qualification for the Europa League next season having been a Champions League side this term. They ha…