European football's governing body rewarded the 32-year-old midfielder's achievements with its annual gong in Monaco last Thursday, although former Madrid team-mate did not attend the gala.
Ronaldo himself has been quiet on the subject, but the player's sister Katia Aveiro, his agent Jorge Mendes and Juventus president Giuseppe Marotta all weighed in on his behalf, before Croatia head coach Zlatko Dalic responded by labelling the five-time Ballon d'Or winner an "egoist".
Del Piero was surprised by the behaviour of the latest darling of the Juve faithful and defended Modric's credentials.
"I understand Cristiano but Modric deserved the award," he told Sky Italia.
"Modric did something extraordinary in Madrid and in the World Cup, so the prize was well deserved. But Cristiano also had a wonderful season.
"I would also get angry in [Ronaldo's] place, but not going to the gala is something else."
And Del Piero feels the UEFA award could be seen as a precursor for football's most coveted individual prize at the end of this year.
He said: "The Ballon d'Or? Often the winner [also] wins the UEFA prize."
The Portuguese star could indeed end up losing out to Modric later this month, as the two have been named among the candidates for FIFA's The Best Player award alongside Mohamed Salah. The winner will be announced at a ceremony in London on September 24.