Muniain is now in the country and after talking up a switch to River Plate, it's emerged the midfielder is set to sign for San Lorenzo.
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TyC Sports says the 31 year-old is in talks with San Lorenzo today and could sign a contract within hours.
He will join as a free agent after coming off contract with hometown club Athletic over the summer.
Muniain has long declared an ambition to close his career in Argentina.