Tottenham centre-back Cameron Carter-Vickers is close to joining Sheffield United on loan, according to Sky sources.
The USA youth captain is being allowed out for first-team games as Spurs edge closer to a deal to sign Juan Foyth from Estudiantes.
The Blades have been in the market for another centre-back all summer, with several bids being knocked back for Blackburn's Darragh Lenihan.
Boss Chris Wilder has been playing with a back-three this season - the same as Mauricio Pochettino - and Bramall Lane is seen as an encouraging place for Carter-Vickers to gain good experience.
Spurs have also been improving their own defence this summer, and recently signed Ajax centre-back Davinson Sanchez in a club-record £38.4m deal.
And they are also back in talks for Foyth - an Argentina youth international who shone at the U20 World Cup.
Carter-Vickers has made four appearances in cup competitions for Tottenham and found life difficult against some of Europe's top sides in the International Champions Cup in the USA in pre-season.