Cristiano Ronaldo was reprimanded by a UEFA official for not wearing a face mask while sat in the stands for Portugal's UEFA Nations League clash against Croatia.

The Juventus ace was ruled out of the game through injury after suffering an infection that is believed to have come from a bee sting.

As a result, Ronaldo was left watching from the stands at the Estadio Do Dragao while his compatriots completed a 4-1 win over Croatia thanks to goals from Joao Cancelo, Diogo Jota, Joao Felix and Andre Silva.

Ronaldo was the only person in the stands not wearing a mask and, during the game, he was seen getting asked to put one on and the 35-year-old duly obliged.

Cristiano Ronaldo was asked to put a mask on after he was seen without one in the stands at Portugal's 4-1 win over Croatia

He could also be left watching from the stands when Portugal take on Sweden on Tuesday, with manager Fernando Santos revealing Ronaldo is unlikely to have recovered from the infection in time.

"I am very doubtful that he will be 100 per cent OK," Santos said. "He had been training well, then suddenly on Wednesday one of his toes was red, as if he'd been stung by a bee.

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Ronaldo duly obliged and wore a mask for the remainder of the game

"Now we have to wait. With an infection, you don't know how long the recovery is going to take."

If he does miss the game then Ronaldo will have to wait for the opportunity to score his 100th international goal.

He has been stuck on 99 international strikes for ten months due to the effects of the ongoing coronavirus pandemic.

Ronaldo's last international goal came in November 2019 in a 2-0 win over Luxembourg and he is just ten goals behind Iran striker Ali Daei, who holds the record for the most international strikes with 109.

"All records must be broken and I will beat that record," Ronaldo said after netting his 99th but his wait looks set to continue.