By Katie Catherall Barcelona manager Xavi feels as though he has “failed” his team this year after his side lost the stubborn defensive record that led them to La Liga success last season. Last year, Barcelona conceded just 20 goals across 38 games en route to a comfortable title triumph, but they find themselves having shipped 43 goals in their 34 games so far this year. Speaking to the media before hosting Real Sociedad, Xavi insisted injuries have hampered his side’s ability to defend but admitted he should have been able to find a solution which would have kept things strong at the back. “…