My point was more that if we sell Cancelo, we'll be relying on a 32 year old Walker to play the best part of 60 games next season. I suppose we could sign another RB but 5/6 signings in one summer seems quite ambitious, although we have done it once before under Pep.
Pep seems to like CJ Egan-Riley and Stones was excellent when used at RB apart from the Madrid game when he was not fit - and he probably appreciated the game time.
We could also bring back one of our many loaned out RB prospects if we wanted 2 fullbacks each side.