Both teams had their fair share of chances and posed a threat to each other especially the first 20 minutes and last minutes of this first half. Unfortunately, Atletico Bilbao lost a good left back defender Yuri to injury just in first minutes. But, they managed to maintain their defensive lines solid and even outperformed Barcelona by creating more opportunities. So in my opinion Barcelona was significantly affected by their absences, especially in midfield which appeared quite weak today and worse than usual which allowed Bilbao more chances if not for Ter Stegen's savings they would receive many goals.
If we don't see Xavi making tactical adjustments and strengthening the midfield, I would bet that Barcelona might concede at least one goal and probably lose the match today.
The match ended up in the favour of Barcelona 1-0, despite the plan Athletic club planned to disgrace Barcelona in their home but their manager reserved some players in the bench that made the match stronger until they achieved victory from the match at 80 minutes. Athletic club really performed well in this match, because many people predicted for the favour of Barcelona to win the match 3-1 to defeat Athletic club, but from the starting of the match prove that it will not be easy for Barcelona to score such goals because of how organized Athletic club players organize to stop Barcelona but they failed at the end. I believe, Barcelona will definitely win their next match to move to second position because the three points they got from Athletic club made them to reach third position which is possible for them to win their remaining matches to return back to first position in the la Liga league table.