Manchester United manager Louis Van Gaal has revealed that Sergio Romero has been brought to the Theatre of Dreams to quickly fill in the boots of David de Gea, if the Spanish custodian does leave United for Real Madrid this summer.

And Van Gaal has stated that there is a "threat" that De Gea is moving to Los Blancos.

"We have to prepare our season with the threat that David De Gea is going to Real Madrid," Van Gaal was quoted by the BBC.

"Sergio Romero can fulfil that because we have to handle it very quickly if it happens."

The Red Devils successfully completed the signing of Argentina custodian Romero, by awarding a three-year contract, with the option of extending a further year.

The Argentine becomes the the fifth signing of the club this summer.

It has been stated thoroughly over the news this summer that the uncertainties hovering over the future of Red Devils custodians Victor Valdes and De Gea will force United to bring in another keeper this summer.

And that is exactly what happened. 

While United manager Louis van Gaal has criticised Valdes vehemently for showing his ego when asked to play with the Red Devils reserve side, Valdes' compatriot De Gea is heavily linked with a move to Spanish giants Real this summer.

And he has now stated the imminent threat of United's current number 1 leaving Old Trafford.

Commenting on Romero, Van Gaal -- who has managed the youngster at AZ Alkmaar previously, and also won an Eredivisie title in 2008-09 -- mentions that the Argentina custodian is a dominating figure in the goal, with regards to his height and other technical aspects of the game.

However, being a Manchester United player is not easy, and since Romero is now part of the Theatre of Dreams, there are other several aspects of the game on-and-off-the-field that the Argentine has to brush up on.

"He is a very dominating goalkeeper, he dominates the 60-metre area, I think that is different in England," Van Gaal said.

"He has to prove that. His stature is also tall and he gives a lot of confidence to the players.

"I have a lot of confidence that he can fulfil what we are expecting, but always with when you buy players you have to wait and see," the Dutchman added.

The Dutch manager has also stated that even if De Gea -- who is currently touring with the club as a part of the preseason tour in the US -- decides to stay at Old Trafford, Romero has to be ready to fight for places in the team.

"You need always competition. When I see that a player is better than the player in the line-up he shall play the next match," Van Gaal stated.

For Romero, it has been a dream come true, and he is looking to reuniting with Van Gaal.

"I am absolutely delighted to join Manchester United. To play for the biggest club in the world is a dream come true for me. Louis van Gaal is a fantastic manager and I cannot wait to get started on this new and exciting challenge in my career," the 28-year-old said.