Manchester City are facing action over their swoop for Argentine teen Benjamin Garre.
Velez Sarsfield have appealed to CAS after world governing body FIFA last year ruled in City's favour following a complaint about Garre's move to the Premier League club in 2016.
A hearing date has been set for July 3, CAS has announced, with FIFA and City both listed in the dispute against Velez.
Garre joined City at the age of 16 last July but Velez claimed the move breached FIFA rules over the signing of minors from outside the European Union.
FIFA rules prohibit the international transfer of players under the age of 18.