I think we need quite a few, but normally by this point in the season we're starting to hear about finalising our key targets, but we're nearly half way through April without knowing what formation we'll even be playing next season, which makes me think we might struggle to make the additions that are required (particularly factoring in international competitions).
I think we need a pacy forward and a CB as an absolute minimum, and depending on the set-up next season, possible a DM and LB/LWB. Maybe even another CB if we're moving to 3 at the back.
Squad depth is broadly decent, but there are a few obvious spots in the starting 11 that are looking upgradeable.