Portugal coach Fernando Santos has not ruled captain Cristiano Ronaldo out of Tuesday's Nations League match at Sweden.
A toe infection prevented the Juventus forward from playing in Portugal's 4-1 win over Croatia in their Nations League opener on Saturday.
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Ronaldo needs just one more goal to reach 100 in his national team career.
"We are going to wait and see how he responds this afternoon and we will make a decision," Santos said in Monday's news conference.
"If in this afternoon's training session he shows the right conditions, there is a big chance he will [play]. If not, he won't. Football things are always unpredictable. What we know is that there are no traces of the [foot] infection. If he feels well with his boots during this afternoon's training, then he has a strong chance to start."
Ronaldo training on Sunday and wrote on Instagram: "Happy to have returned!"
Santos says the former Real Madrid star will only feature against Sweden if he is fit.
"The fact that he is very happy here doesn't mean that he is going to play," he said. "It doesn't work like that with me. We are talking about the best player in the world full stop."
Ronaldo, who captained Portugal when they won the inagural Nations League, scored his 99th goal in a 2-0 win over Luxembourg in a Euro 2020 qualifier in November.