Vito Mannone says that Santiago Vergini has done brilliantly since returning to Sunderland this summer.
The Argentine defender was brought in on a temporary move by Gus Poyet during the previous transfer window and Mannone believes that the Argentine has made a great to start to his second spell at the Stadium of Light, after he also played on loan for them last season.
"I think Santi has shown great character," he said in the Shields Gazette.
“It wasn’t an easy situation for him, or for any of the boys who came from Argentina because it’s difficult to adapt to this style of football but he’s done marvellous I think.
“It was hard for him in the first few months, but he won his place at right-back and he was a big player for us achieving safety and staying in the Premier League.
“This season he’s shown he can do the same at centre-back and I think we have a very good player on our hands.”
Vergini has already made eight appearances for the Black Cats this season and he has added great competition for places in their back-line.
Sunderland have proven a tough outfit to beat this campaign, but they had to wait until last weekend for their first win of the season.
Gus Poyet's side beat Stoke City 3-1 in front of their own fans to relieve some of the pressure that was beginning to build on them, with the goals coming from Steven Fletcher and Connor Wickham.
It was a performance that Sunderland will now be looking to build upon and the hope is that they elevate themselves away from relegation trouble after facing a battle against the drop for all of last season.