By Ewan Murray Barcelona continue their La Liga campaign on Saturday when they host Athletic Club at the Estadi Olimpic Lluis Companys. The Catalan giants got their season off to a winning start last weekend by beating Valencia 2-1 despite a raft of injuries and absentees. The Hansi Flick era’s successful start was indebted to a brace from Robert Lewansdowski, whom the German manager frequently relied upon during their time together at Bayern Munich. Athletic Club will pose a similarly tough test for Barcelona this weekend as selection issues continue to plague Flick. Barcelona have now lost I…