City signed Benjamin Garre from Velez in July after he turned 16, beating off competition from Manchester United and Barcelona.
An Argentinian regional league has condemned a "deplorable and despicable" attack by a player on a referee in a match on Sunday.
Newell's Old Boys are hopeful they can bring Lionel Messi back to the club after the 2018 World Cup in Russia, when he will have turned 31.
Lo Celso, 20, has joined the Ligue 1 champions from Rosario Central on a five-year contract but will remain on loan with the Argentine club.
Genoa have signed Giovanni Simeone, the son of Atletico Madrid head coach Diego Simeone, from River Plate.
Sevilla completed the signing of Argentina defender Gabriel Mercado from River Plate on Thursday.