The humorous message came to light after Musso posted a photograph of the forward's autograph on Instagram. Penning a light-hearted note across the front of the kit, the legendary attacker wrote: "For Juan, with much affection. I'm going to miss smashing goals past you and watching you get pissed off."
Reacting to the playful inscription, the 32-year-old goalkeeper added a brief caption to his post: "Forever grateful."