Rugani should have been the one excluded, lets not kid ourselves. Even with Giorgio's injury. Bonucci, DL, Demiral, Can and even Danilo and DS can play CB if needed.
Yeah, just like DeSciglio needed to play at center back in 1/4 finals vs Atalanta with Rugani as a partner and both did awesome job in letting only 3 goals past Woj.
Lets not kid ourselves, your suggestion is to register only three center backs for the first 6 games in CL and hope all of them stay fit, otherwise IF NEEDED we can always play:
1.Emre fucking Can as a center back (position he has never played except in his final season at Bayern Academy BEFORE he joined Bayern`s SECOND TEAM and his first season at Liverpool during the time their coach was Brendan fucking Rogers, since Klopp he`s always played in midfield);
2.DeSciglio (who was awesome against Duvan Zapata last time he played CB) and
3.Danilo (who has never played as a center back, he`s played as a midfielder in his early days and after that - versatile fullback, both on left or right side).
Awesome!
Also, to be clear - both Rugani and Emre Can have no place in Juventus roster and both of them should have been sold this summer, they are not good enough to be a back up for this Juventus side. However, since both of them are still here and with one CB injured for the better part of the season and with 1 player left to register it is the most logical thing to register Rugani as the 4th CB than Emre Can as the 7th midfielder and start the CL with only 3 center backs in the squad.