Not frequently. I would guess he only gets minutes because of how awful Alex Sandro has been
https://www.transfermarkt.us/luca-pellegrini/leistungsdatendetails/spieler/346567/plus/0?saison=2021&verein=&liga=&wettbewerb=&pos=&trainer_id=
If you want a new LB to come in then surely it makes sense to sell Pellegrini. Nobody is going to buy Sandro or De Sciglio meaning they are inevitably the depth and cash in where you can.