Zizou is still living down the lasting image of the infamous headbutt to Italy's Marco Materazzi, the final time the world saw him in a competitive match. He remains officially retired from soccer after a brilliant 19-year career which ranks among the best to ever play the game. But the French legend hasn't stayed away entirely. Zidane continues to make promotional and goodwill trips around the world, and those MLS rumors won't seem to go away. Could the 34-year-old resurface stateside?