Spanish forward Aritz Aduriz could reportedly miss Athletic Bilbao's Champions League match against Porto this week with a hamstring strain.

The experienced striker picked up the injury moments after scoring the winning goal in his side's 1-0 victory over Sevilla in La Liga on Sunday.

According to various reports in Spain, tests have revealed that the 33-year-old has suffered a muscle problem, but the severity has not yet been ascertained.

Aduriz, who has scored four league goals for Bilbao this season, is expected to undergo further tests on Monday ahead of the European clash on Wednesday.