New Manchester United goalkeeper Sergio Romero has said he came to Old Trafford to help his old boss Louis van Gaal win silverware.

The Red Devils confirmed the arrival of Argentina's first choice goalkeeper as a free agent on 27 July after agreeing a three-year deal that includes an option for an additional 12 months.

Having previously managed him during his time in charge of Eredivisie outfit AZ Alkmaar, Van Gaal hailed the signing amid continued rumours surrounding the departure of David De Gea to Real Madrid.

"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," the manager admitted.

The Argentinian custodian has now also expressed his delight over the move, although he refused to state whether he expects to be the first name on the team sheet or just a back-up for De Gea or any potential other signings.

"From the very first moment that I heard there was a possibility of joining this club, I have been thinking constantly about lots of things: playing for the club, training with the other players, getting to know my teammates and winning silverware for United," the former Monaco and Sampdoria keeper said to the club's official website.

"I'm here to help and to work hard whether it's been for my club or my country. I've always worked hard with my teammates so that I'm 100% ready for action when the manager calls on me.

"Manchester United is one of the biggest clubs in the world because of the history. That's why it's such a dream come true to be sitting here now, wearing this shirt."

Romero added that the possibility of reuniting with van Gaal played a crucial role in his decision.

"He is a great manager. He's the kind of boss who puts you at ease and from the first moment that I was given the goalkeeper shirt by him in 2007, he told me that I would play an important part in his squad. It was a vital period for me because from the moment I signed for him, my career started to really take off," he said.

"He is someone who has been very important in my life. He helped me a lot when I arrived in Holland as I didn't speak Dutch and I didn't speak English but he spoke Spanish. He is very honest and open as a person, he helps and reassures you and he cares about every player and every member of staff."