There a lot of "rumours", that we could spend easily 200m this season, because we need a huge rebuild. There is a chance, Kroenke will support it this summer.
A Right CB would be the last position on my priority list, because we have Saliba, Holding and Chambers for the spot and our defensive was quite stable last season. we need a competitor for Leno, a Back-Up for Tierney, a Right Back Starter, two midfielders and an offensive midfielder (Ödegaard and Ceballos loan ended, Xhaka will probably leave) - surprisingly the first signing will be a RCB.
And a lot of players should/could leave: Ryan, Ceballos and Ödegaard's loan ended. Luiz left. Bellerin is for sale, Xhaka close to Roma, Willock could leave after his good loan, Nelson could be for a loan, Willian could leave again, Lacazette and Nketiah for sale. So many positions have to be filled.