Sergio Romero
Sergio Romero has agreed a three-year deal to join Manchester United this summer. (Getty)

Free agent goalkeeper Sergio Romero has reportedly agreed a three-year deal to join Manchester United this summer, according to Italian publication Gazzetta Dello Sport.

The Argentine stopper has been without a club following his exit from Serie A club Sampdoria at the end of last season. He is currently on holiday following his participation in the 2015 Copa America in Chile.

Louis van Gaal is looking to sign a goalkeeper this summer to replace Victor Valdes, who has been put on the transfer list by the Dutchman for not following the philosophy of the club, while David de Gea's future at the club also remains uncertain amid keen interest from Real Madrid.

Romero, according to the Daily Mail, has been in discussions over a move to Old Trafford this summer, and the Italian publication claims that he has now agreed a three-year deal and will earn a fee of around €1.8m (£1.3m, $2m) per season.

The 28-year-old goalkeeper is a regular member of the Argentine national team and played every minute of the Albiceleste's games during the recently concluded Copa America tournament. The World Cup finalist did not have a positive year on the domestic front, as he made just 11 appearances for Sampdoria last season.

Apart from the 20-time English champions, the report claims that Serie A giants AS Roma and Inter Milan were also interested in securing the stopper's services, but it is believed that Romero preferred a switch to Old Trafford rather than remaining in Italy.

United are currently on their pre-season tour of the United States and are preparing to take on Barcelona in their third game of the International Champions' Cup at the Levi's Stadium in San Francisco on Saturday, 25 July.