Manchester United boss Louis van Gaal says new goalkeeper Sergio Romero will add experience and leadership to the United defensive department.
The 28-year-old was a free agent after leaving Italian side Sampdoria and will replace back-up goalkeeper Victor Valdes who will leave in the summer.
He signed a three-year contract with the Red Devils and will reunite with van Gaal, who was AZ Alkmaar's manager during the Argentine's spell in Holland.
"Sergio Romero is an international goalkeeper from the Argentina team," the manager told the club's official website.
"He was also a former player of mine. I was trainer-coach, manager of AZ Alkmaar in the Netherlands, I picked him up when he was 19 and he was a great talent.
"We became champions with him, with a minor club, and in the Netherlands it was a fantastic result of course.
"I know him very well and I think in our situation, if De Gea is going or not going, it is always a threat and we have to take care, make sure that we are prepared and that is why I think it is very good that Sergio Romero is now a Manchester United player.
"He is a goalkeeper and he stops the balls, and that is also his position but he can also build up with his feet and that is, in our profile, very important. But also his stature is very good, he is tall.
"In the Netherlands he dominates the 60 metre area and I don't know if he can do that in England, because it is a little bit different, but he is physically strong and he has confidence in himself, which is also very good I believe.
"He did very well in the World Cup against us [Netherlands] because he stopped the decisive penalties [in the semi-final]."