FLORENCE, Italy, May 29 (Reuters) - Italy will start the friendly against Belgium with their usual three-pronged attack, coach Roberto Donadoni said on Thursday, although changes in formation are possible after experiments in training. Friday's match in Florence is Donadoni's last chance to hone his tactics ahead of next month's Euro 2008 tournament in Austria and Switzerland. 'We will start off with the trident even if we decide upon the actual lineup in training tomorrow morning,' Donadoni told reporters. Luca Toni is expected to be the lone frontman with Alessandro Del Piero and Antonio Cassano, both recalled to the squad after long absences, pushing for a start in the wide berths. 'Those two are in good condition and this makes me happy. We will try to let everyone play a little,' Donadoni said. The trident was not always effective in Euro 2008 qualification and Donadoni has talked at length about the need to be flexible. Media reports said the coach experimented with three at the back in Thursday's training. Earlier, the world champions were addressed by Italian referees' chief and former top official Pierluigi Collina, who told them to especially avoid dangerous tackles, diving and insulting the referee next month.