BALLERS II, A Fantasy Gridiron Football (FGF), is fan-made supplement for the ZWEIHÄNDER RPG for the Bloodblitz Football (which Warhammer fans may found pretty familiar…). It is also (huge) extension build around Blizballer profession featured in the official MAIN GAUCHE sourcebook. It features amazing amount of details and new rules and professions. This product is creation of Mariusz Malinowski (aka "Baller") and Raymond Wadsworth (aka "Yig").
You can find the supplement from DriveThruRPG - ZWEIHÄNDER Grim & Perilous Library