From our squad I think: Ndombele, Kane, Son, Sanchez, Sessegnon, Winks, Lloris and Moura, Alli, Vertonghen all range from high potential (at least shown in the past, I think it's hard to tell currently .. see Trippier), all the way to world class with Kane. The likes of Sissoko, Rose, Lamela etc are all decent squad players too.
A couple of those are ageing (lloris, vertonghen) but in the right system can still do a good job and are hardly ancient. Players like toby/eriksen obviously want to go so I haven't included them. I also haven't included Lo Celso who has been injured so we haven't really seen him, but he was a 55m investment and was quality in La Liga.
So there's still a handful of players there to form a really decent team, with investment clearly needed in terms of the back 4. It's hardly a team that totally lacks talent.