Argentina as expected have brought in Luis Gonzalez to replace Esteban Cambiasso in midfield ahead of this afternoon's Group C match with Serbia and Montenegro.
Serbia & Montenegro coach Ilija Petkovic also made one change to his team.
Petkovic, whose side lost their opening match 1-0 to Netherlands last Sunday, dropped right back Nenad Djordjevic and brought in winger Ognjen Koroman.
With Koroman adding pace to midfield, Serbia will want to start more adventurously than against the Dutch and hope that Dejan Stankovic and Predrag Djordjevic have more room to operate.
Argentine coach Jose Pekerman wants creative midfielder Juan Roman Riquelme to push further forward his two assists in their opening 2-1 win over the Ivory Coast.
Teenage prodigy Lionel Messi is on the bench, having recovered from a slight injury to his left foot early in the week.
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