The Argentine will join the Black Cats for the rest of the season, with the option for a permanent deal in the summer should Gus Poyet be impressed.
Vergini had been on loan with Argentinian side Estudiantes, but is owned by Uruguayan side Atletico Fenix. But now the 25-year-old will ply his trade in England, at least until May, joining Marcos Alonso as Sunderland’s two January signings. Both players are on loan deals.
The defender could play against Manchester United on Wednesday in the Capital One Cup, should his international clearances comes through in time. Sunderland hold a 2-1 lead over the Red Devils ahead of the trip to Old Trafford, with a trip to Wembley for the cup final on the line.
Vergini has experienced European football before, after spending a season on loan at Verona in Italy. The 25-year-old has also had a taste of international football, playing 17 minutes in a friendly against Brazil in 2012.
Sunderland’s draw against Southampton on the weekend lifted them off the bottom of the Premier League, now joint 18th with West Ham and Cardiff, who have taken the Black Cat’s spot at foot of the table.