Guehi is young, calm and good with his feet but he plays LCB. I always had him as Virgils ultimate replacement.
Virgil plays every minute for a reason, so I don't know who would want to come in for odd minutes here or there, especially in a world cup year.
Maybe Guehi can play RCB too but it would be new to him, I think. We need better cover than Quansah and Gomez but buying backups is maybe harder than finding starters.