I would think EL squad will be :
Lloris (Hart, Whiteman)
Doherty (Aurier) - Sanchez (Tanganga, ) - Alderweireld (Dier) - Reguilon (Davies)
Hojbjerg (Sissoko) - Lo Celso (Winks)
Bale (Moura) -Ndombele ( Dele) - Son (Bergwijn, Lamela)
Kane (Vinicius )
Those 24 players, categorised by UEFA would be :
Club Trained - 4 ( Kane, Bale, Winks, Whiteman, )
Other Assoc Trained 2 (Hart, Dele)
Overseas Trained 17 (Lloris, Aurier, Doherty, Sanchez, Alderweireld, Dier, Reguilon, Davies, Hojbjerg, Sissoko, Lo Celso, Lucas, Ndombele, Son, Bergwijn, Vinicius, Lamela)
Under 21's 1 - Tanganga
No Space for extra Overseas Trained Players - Rodon
There are 2 spare HG places, possibly one to Alfie Devine (does not qualify as an u21 as he has not been at Spurs for 2 years), leaving one spare HG space (possibly George Marsh only remaining over 21 in u23's or Marcel Lavenier an u23 RB arrived this year ? ).
And the correct answer was Marcel Lavenier (RB)..........as predicted !
Lavenier is quite versatile playing RB and LB (played almost half Spurs u23 games so far as a LB) and CB. I imagine he's likely to play as a RB