Indeed, Sanchez has declared his Blues teammate as the best midfielder in the world.
Caicedo was outstanding in Saturday's win at Tottenham and Sanchez said: "I don't really need to talk about him but he's an actual animal.
"He's the best player on the planet in his position. He's one of the best in the world, who is better than him in that position? He's a beast. Every 50-50, every challenge he wins and is so composed on the ball."
The pair were also teammates at Brighton and Sanchez continued: "I haven't seen him change much. As a player and as a character, he's always been the same, hard work, effort, quiet but a very good guy.
"Obviously, he's filled out with his body a bit more with age and with experience, he's just got better and better on the pitch. His confidence has also gone higher and higher. He's a boss at winning the midfield."