David Villa
David Villa joined Barcelona from Valencia in 2009. REUTERS

Liverpool have completed the signing of highly-rated United States youth international Marc Pelosi who will join the club's academy after finalising a move from De Anza Force.

Pelosi, 17, has played 28 times for the USA Under 17s, scoring eight goals in the process. Liverpool moved to sign the promising midfielder after a string of impressive performances at this summer's youth World Cup in Mexico.

"We're determined to identify the best possible talent globally and I'm delighted we've been able to bring Marc in to the club," academy director Frank McParland told the club's official web site.

Meanwhile, Liverpool have made contact with Barcelona over the availability of David Villa and Seydou Keita, according to reports in Spain.

Cadena Ser reports that the Reds are lining up a £34.2m January bid for Villa as they look to secure a Champions League berth this season.

Villa, who has scored 30 goals in 69 games since joining Barcelona in 2009, is reportedly unsettled at the Nou Camp after finding himself marginalised by Lionel Messi's recent run of form.

Keita, Pep Guardiola's first signing as manager in 2008, has started just five games for the La Liga champions this season and could be available for around £14m.