The Spain international, who wore the No.14 shirt for Atleti, will take on the No.16 jersey for City.
READ: City sign Rodri
The most famous previous owner of the No.16 shirt for the Blues was Sergio Aguero, who took the number from his arrival in 2011 (also from Atleti) until 2015.
The squad number has been vacant ever since.
Prior to Sergio, Kasper Schmeichel, Sylvinho, Nicky Summerbee and Peter Reid have also taken sixteen.
Defenders Paul Ritchie and Vedran Corluka and Nedum Onuoha are the only other City players to have the same number.
Come and meet our new signing in the CityStore today (4 July) at 5.30pm! Rodri will be making a special appearance at the Etihad Stadium campus store, so don’t miss out!