Milla, who won La Liga twice with Madrid and once with Barcelona during an illustrious playing career, said the 22-year-old would be a natural fit at City should the club opt to make him their record signing.
Signing Rodri now gives Guardiola a ideal amount of time to help him learn the demands of the position in a very particular system and adjust to the physical nature of the league, all while using Fernandinho as an example of what is expected.
According to Sky Sports, the Premier League champions have agreed to pay Rodri's £63million release clause to Atletico.More news: Image sums up ice-melt threat
More news: Four shot in Toronto as NBA champions Raptors celebrate with fans
More news: Acting ICE director urges people in U.S. illegally to turn themselves in
The 1.9m Rodri is seen as a long-term successor to City's 34-year-old Brazilian midfielder Fernandinho, whose absence has sometimes caused problems for Pep Guardiola's side.
Atletico seem destined to lose several players in the summer, with Antoine Griezmann, Diego Godin, Jan Oblak and Filipe Luis all likely to move, whilst Lucas Hernandez has already sealed his move to Bayern Munich. At €70m, it would nudge aside their previous biggest fee of €67m (£60m) paid to Leicester City for Riyad Mahrez last summer.
Rodri is regarded to be in the same mould as Sergio Busquets, one of Guardiola's trusted lieutenants at Barcelona.