Barcelona goal keeper Marc Ter Stegen has called on his teammates to keep improving as they look to retain their La Liga title.
The German international was outstanding in Sunday night's 0-0 draw at Athletic Bilbao, as the Catalan side maintained a six point lead at the top, over Real Madrid.
"There are always things that we can improve on and that is what we have to do.
"It was a justified draw."
Barcelona have endured a tough run of fixtures and they face a taxing run before the end of February and Ter Stegen added that the squad could be suffering from tiredness.
"Today's result could be because we were tired, and February will be a very busy month."