West Ham manager Avram Grant has strengthened his attack with the signings of Mexico winger Pablo Barrera and Lyon striker Frederic Piquionne.
Barrera, 23, arrives for a fee of £4m on a four-year deal from UNAM Pumas after impressing during the 2010 World Cup finals in South Africa.
Piquionne, who played for Grant on loan at Portsmouth last season, has signed a three-year contract at Upton Park.
West Ham have promised more signings over the next three days.
Barrera made three substitute appearances for Mexico at the World Cup as they advanced to the second round.
The pacy wideman, who featured against England in Mexico's 3-1 defeat in May, is nicknamed 'Dynamite' in his homeland.
"I have been really taken by the reception I have received from the players and the manager," he said.
"The fans can expect that I will give 100% to succeed for the team and to play better than I have ever played before."
France international Piquionne said: "I'm coming to work hard for the squad and I hope we have a good season."
Barrera and Piquionne are Grant's second and third signings after Germany midfielder Thomas Hitzlsperger arrived on a free transfer from Lazio.
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