u23 players can't rejoin the u23 squad if they are called up more than 5 times. dunno if it affects coppa too but i guess we're taking that into consideration too.
I could be wrong but by the names, this Fiorentina team has some talent on them. I don't know if they have a good ensemble. But if they are motivated, combined with Juve's tiredness, you could have the recipe for an ugly result in there..