Spanish La Liga leaders Barcelona fell to a 1-0 loss against Real Sociedad on Sunday evening at AnoetaThe Catalans giants failed to make a shot on target in a La Liga match for the second time since at least the 2003/04 seasonsHansi Flick's side thought they had taken an early but Robert Lewandowski's effort was ruled out for offsideThe primary reason Robert Lewandowski's goal for Barcelona against Real Sociedad was ruled offside has come to light.

Barca lost 1-0 to Real Sociedad, but all the focus has been on a controversial decision to rule out an effort from Lewandowski

The Blaugrana will be asking questions after their star striker saw a goal controversially ruled out for offside in their defeat at Reale Arena