Adryan’s season-long loan from Flamengo was announced shortly after today’s 1-0 win over Bolton and a deal to bring Del Fabro to Leeds looks set to be finalised tomorrow afternoon.
Del Fabro, 19, is an Italian Under-19 international who has been at Cagliari - the club formerly owned by United president Massimo Cellino - for the past two seasons.
Leeds appear have reached an agreement to take the young centre-back on loan for the rest of the 2014-15 term, and the transfer will give United an option to sign him on a permanent basis next summer.
Leeds are also in the process of putting the finishing touches to the transfer of forward Brian Montenegro from Nacional in Paraguay and expect to confirm his arrival on loan before the FIFA transfer window closes at 11pm on Monday night.
Adryan, meanwhile, has become Leeds’ 13th summer signing after a patient pursuit of the Brazil Under-20 international.
The 20-year-old was six months into an 18-month loan at Cagliari but Cellino convinced Cagliari to send him back to Flamengo early and allow Adryan to come to England.
Adryan is awaiting international clearance but will be available to make his Leeds debut when United travel to Birmingham City after the international break.
Like all of the loan deals agreed by Cellino this summer, United have the right to buy Adryan for a fee of around £3m at the end of the season.