The Portugal captain's armband which Cristiano Ronaldo threw to the ground in a tantrum after his goal was incorrectly disallowed in a World Cup qualifier against Serbia at the weekend is now being auctioned off by firefighters for a good cause.
The blue armband with a white letter C was picked up by Djordje Vukicevic and then put up for a charity auction by him and his colleagues in Belgrade's fire brigade.
They're hoping the sale will help raise funds to pay for the treatment of six-month-old Serbian boy Gavrilo Djurdjevic, who is suffering from spinal muscular atrophy.
"Ronaldo was agitated (and) he threw the armband, it fell right next to me," Vukicevic explained on Thursday.
The 36-year-old Juventus star had stormed off the pitch on Saturday, throwing his captain's armband to the turf when he was denied a clear stoppage-time winner in the 2-2 draw in Serbia.
Many Serbians resort to fundraising and humanitarian auctions to collect money for medical treatment abroad when they cannot get adequate treatment at home.
Vukicevic said he was ready to sell any memorabilia he could collect from players to help Gavrilo's parents raise the 2.5 million euros ($A3.9 million) needed for his treatment.
"The entire crew agreed this (armband) will go for little Gavrilo," he said.
In the village of Cumic, just outside the city of Kragujevac in central Serbia, Gavrilo's mother Nevena said the family had received donations of around 500,000 euros ($A774,000) so far.
She added that the proceeds from Ronaldo's armband would be a significant contribution.
"We could not believe that some people who do not even know us... would take the armband, auction it and help our child," she said.
So far, bidders have offered around six million dinars ($A79,000) during the auction on Serbia's Limundo e-commerce platform.
"This captain's armband, which has attracted the most media attention of all armbands ever, can be yours if you join this charity auction and bid," the advertisement says.