why Fiorentina must sell Gilardino?/

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i think this was crazy..why Fiorentina must sell one of their best forward?? i know that Gila had down season in 2011, but fiorentina management should ask to Gila whats up and found out why Gila can`t score many goals?? i think the decision is so quickly and is not good for Fiorentina..they was lost by one of the great killing machine.. what do you think for fiorentina after Selling Gilardina??