MADRID - Midfielder Andres Iniesta has suffered a recurrence of a thigh muscle injury and could be in doubt for Spain in the Confederations Cup, Barcelona coach Pep Guardiola said on Friday. "All those Barcelona players that have to go the Confederations Cup will go, but be careful with Iniesta," Guardiola told a news conference. "In the Champions League final he had a relapse on his injury and it's in a very complicated place. If it's not treated properly it could be difficult for him, for Barcelona and for Spain." Vicente del Bosque is due to name his squad on Monday for next month's Confederations Cup in South Africa.