Isak started the two opening matches of the Nations League group against Slovenia and Norway, but started already in the 65th minute of the match against Norway.
Two days later, he was in charge of the collective training due to "a feeling".
He was in the squad for Thursday's home match against Serbia but played nothing.
On Friday, he attended the national team's press conference.
- It's okay, I rested a bit today with the hope of training fully tomorrow.
There are still two days left but the goal is to be completely ready for Norway, says Isak.
Are you one hundred percent now?
- It is not one hundred percent today because I did not train, but it is on Sunday I will be one hundred.
On Sunday, Sweden will meet Norway away and chase revenge after Thursday's loss.
- It was not a good result for us, we want to win matches.
Then you got to see many individually good performances, there is some potential.
We got a little hollow, but it's not strange if you look at our starting eleven where some have not played that much.
The striker has scored ten goals in 41 matches in all competitions with his Spanish club Real Sociedad.