The son of the Barcelona hero Samuel Eto'o, Etienne made his senior debut for Rayo in defeat to Villarreal on Saturday.
Then on Sunday, Eto'o returned to start for Rayo B against former club CUC Villalba and scored a hat-trick. He now has 21 goals in 23 games in the Tercera RFEF.
Afterwards, Eto'o posted to social media: "February 22, 2025 is the date when everything seemed to make sense , but the reality is that it all started much earlier.
"Since I was born with the innocence of a child and driven by the inspiration of my father, there was no field, yard, park or garage that escaped me . Since childhood, the question accompanied me: What do you want to be when you grow up?
"A footballer, without knowing very well if it was perhaps politically correct or rather what I really wanted to be. Over the years I understood that no, I was forging a determination and unbreakable will to be a footballer."