Signing for Atletico Madrid in the modern age is something like a confirmation that a player is at the top of his game, or that he has the potential to do so.
It's a move that carries weight, should be a career highlight and offers the possibility of winning trophies—though, it hasn't always been that way at the club, of course. Even so, a history as rich as Atletico's has produced plenty of great players who then go on to achieve further greatness elsewhere.
Sometimes, though, after leaving the Vicente Calderon, that's it for a player's dreams of hitting the top.
A downward spiral of form, fitness and happiness at further clubs can leave players wishing for the surroundings of Los Rojiblancos and their fervent fans—and with Jackson Martinez having given up La Liga for the Chinese Super League this week after just six months at the club, a few might be wondering if he'll end up the latest addition to that list of players.
Here we take a look at five such individuals who saw their best days wearing the red and white of Atleti and were never quite the same player again afterwards.