Man City sign teenage midfielder Claudio Echeverri from River Plate
Echeverri will remain at the Buenos Aires club, where he has so far made six appearances since his debut last June, until January next year.
The player captained Argentina at last year's under-17 World Cup in Indonesia, scoring a hat-trick in a 3-0 defeat of Brazil in the quarter-finals before his side lost on penalties to eventual winners Germany in the semi-finals.
Echeverri follows Argentina forward and 2022 World Cup winner Julian Alvarez in joining Premier League champions City from River, who are managed by former City defender Martin Demichelis.
No financial details were given although British media reports indicated the deal was for £12.5 million with add-ons.