I think there are only 2-3 world class wingers we could sign that would immediately come in and raise our attack a level - Leao, Kvara, and Rodrygo (not including obvious answers like Vinicius and Mbappe). All three are likely unavailable this summer but if they become available, we should do anything we can to bring them here.
After that, I think there's a tier of "almost there" wingers due to either age or injury/inconsistency. I'd include Pedro Neto and Nico Williams here. If we can't get one of the world class wingers above, I think we have to come out of the summer with one of these two. If Martinelli is injured or needs a rest, the lack of line breaking pace in the squad is very evident. We need to inject more pace into the squad, as well as more 1v1 ability, and a quick winger this summer is a must.
I also have some interest in Zhegrova from Lille. He's a little one-footed for my liking but he's got a lot of Mahrez in his game and could be an effective rotation piece/Saka backup.