West Ham sign Mexico striker Franco
No contract details were given on West Ham's website but the 32-year-old Franco, who had been without a club, was delighted to get the opportunity of first-team football in the lead-up to the 2010 World Cup.
"This is a very important stage in my career and I hope to score lots of goals for the club this season and then play at the World Cup," the former Villarreal, San Lorenzo and Monterrey player said.
A member of Mexico's 2006 World Cup squad in Germany, Franco was called up by national coach Javier Aguirre for this month's 2010 qualifiers and scored in the 3-0 win at Costa Rica.
West Ham, 13th in the standings, host Liverpool on Saturday.