Carlo Tavecchio, president of the FIGC, was clear about the next European Under-21, an event that will be held in Poland from June 16 to 30:
The national coach, Gigi Di Biagio will bring the best – Donnarumma, Gagliardini, Rugani, Romagnoli and Bernardeschi – are the names who will most likely get called up for the national team. Gazzetta dello Sport writes that negotiations between Ventura, the FIGC and the clubs will be open (Milan, Inter and Juventus) to find a balance.
Source: Gazzetta dello Sport

Roberto is turning 23 in almost a month: how could he possibly qualify for an under 21 tournament?
They can have 2 or 3 older players as well
I figured as much, but do you know if their is an age limit? Or maybe a senior national team caps limit?
no age limit but rather give a chance to youngster to grow better for the national team , some funny shit I remember when buffon was young and both Italy teams the under 21 and the senior squad were playing in the euros tournament and buffon was under 21 but the senior squad requested him to play with the big boys while they had like the best goalkeepers in the world available to them pagliuaca and perruzi and caused many angers, at that time I was like damn this buffon is a hell of a keeper
That is funny: Buffon was excellent even then, but that seems so unnecessary to call him up. It was obvious from a very young age, similar to Donnarumma, that he’d be one of the best.
donna lacks major positioning, buffon was just unbelievable