Professionalism is part of the game.... and not only professionalism, many more things.
yes it is! And a huge part of the game. Just see how great Ronaldinho, Ronaldo, Adriano and the likes were, but they all lacked professionalism, and see where they all ended up. Cassano for this reason is ended up in Sampdoria, and not because of his abilities, he improved a lot lately, for this reason we are hearing his name a lot, but I think it is too late for him, I always wanted him with Juve, but it's too late, he is not a young player anymore, If I would find a replacement for Del Piero, I would look somewhere else, Aguero or Lavezzi, then again Lavezzi also lacks professionalism.