Next summer there will be a number of players we need to buy - possibly including LB, RB, CB ( possibly two), DM, back up striker and GK.
The biggest constraints on buying atm is not money ( although that always helps) it's both identifying the "right' players and also clearing out the current squad ( perhaps Wanyama as he has hardly played for 2 years).
There's plenty to deal with without adding Lo Celso to the list.
If Mourhino decides Lo Celso is a decent player for Spurs, he will stay.
A bigger question is where is he capable of playing ?
Atm Dele has been resurected as no 10/2nd striker and with Son in good form that leaves one first team place at AM shared between Moura, the ever injured Lamela, possibly Sessegnon, possibly Sissoko, Eriksen if he stays....and Lo Celso.
We probably need 5 or 6 options going forward so plenty of room for him to secure a place - if he shows the right attributes.
At CM we have Ndombele, Winks, Dier , Skipp and possibly Sissoko - but probably none of those places nailed down.
It's 3 matches into Mountinho" s reign so not surprised that most players have not been nailed down into their places - and we actually have a big squad. With some 25 players.
Think things will be clearer in January.