The former Tigres will arrive on loan to Madrid with a purchase option.
He will provide the Spanish league the opportunity to enjoy the South American's dizzying speed.
They call him 'Bolt' Advincula.
Just to explain his nickname, the footballer was able to reach 36 km/h according to 'Marca'.
The only other player who has even approached that sort of speed is Kylian Mbappe, who is still a little way of the Peruvian's mark.
The match in which he made history was against Chivas Guadalajara.
Advincula practically ran circles around the opposition.
At one point, the opposition had possession at the other end, and he was able to overtake all other players to reach the ball.
A bestial demonstration of his speed.
He travelled 68.3 metres in 6.82 seconds.
Now that he is on loan to Rayo, he'll have the opportunity to show off his speed in LaLiga.