Interesting Bernardeschi has played fullback before. He did it against Lech in Europa. I distinctly remember him playing wingback with Paulo Sousa but in this game it looks like he ended up playing as a fullback. Obviously not anyone’s first choice but perhaps he’d be an option in an emergency as well.
As for reverting to a back 3. Of Chiellini were healthy I’m sure that would be an option - you could play Chiellini, Bonucci, Rugani all who have played in one. With Chiellini hurt, you would either throw de Ligt into tactical hell, or you’d push Can in the role. Both are risky.
The safest imo is Beruatto. He’s a natural fullback, is game fit, and it’s against Spal.
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