Tottenham Hotspur midfielder Erik Lamela and Benfica winger
Nicolas Gaitan have been drafted in to coach Gerardo Martino's squad for the
match in Duesseldorf, the AFA said in a statement.
"(Messi) is suffering from muscle fatigue in his
right hamstring. He is ruled out as a precaution," said the statement
posted on the AFA website (www.afa.org.ar).
The AFA listed forwards Maximiliano Rodriguez and Rodrigo
Palacio and central defender Ezequiel Garay as also unavailable through injury.
It added that winger Ezequiel Lavezzi was under
observation after missing Paris St Germain's Ligue 1 match at the weekend with
back trouble but he was included in a revised squad.
Lamella and Gaitan, who have a handful of caps between
them, join a 20-man squad now captained by Javier Mascherano.
The teams meet again in their first international since
Germany beat Argentina 1-0 after extra time in the World Cup final in Brazil on
July 13.
Revised squad:
Goalkeepers: Sergio Romero (Sampdoria), Mariano Andujar
(Napoli)
Defenders: Pablo Zabaleta (Manchester City), Federico
Fernandez (Swansea), Marcos Rojo (Manchester United), Hugo Campagnaro (Inter
Milan), Martin Demichelis (Manchester City), Jose Basanta (Fiorentina)
Midfielders: Javier Mascherano (Barcelona), Fernando Gago
(Boca Juniors), Lucas Biglia (Lazio), Ricardo Alvarez (Inter Milan), Augusto
Fernandez (Celta Vigo), Angel Di Maria (Manchester United), Enzo Perez
(Benfica), Erik Lamela (Tottenham Hotspur)
Forwards: Gonzalo Higuain (Napoli), Sergio Aguero
(Manchester City), Nicolas Gaitan (Benfica), Ezequiel Lavezzi (Paris
St-Germain)