The 19-year-old had only been on the pitch for seven minutes when he subbed 0–2 in the second half and nodded the ball into the net. The only problem was that he was in a tight offside position when he put the boiler on - something that took four minutes for the subsequent VAR review to arrive.
Isak, who was acquired from German Borussia Dortmund in early summer, started for the third consecutive La Liga match on the bench and replaced striker Willian Jose when coach Imanol Alguacil replaced him.
The match ended 2-0 after both goals, punctuated by Athletic Bilbaos Iñaki Williams and Raúl García, came in the first half.