Question: Which Czech retired footballer who operated as either a central defender or a right back was among the highly rated players to sign up for Fiorentina?
{'answer': 'Tomáš Ujfaluši', 'supporting_facts': [['2004–05 ACF Fiorentina season', 2], ['Tomáš Ujfaluši', 0], ['Tomáš Ujfaluši', 1]]}