"I'm happy to be here," the 'keeper, who hasn't played since the 2010 World Cup after a falling out with Cagliari chief Massimo Cellino, stated.
"It'd be great to play football again - it's the end of a nightmare. I have always trained with consistency and I'm happy that President Claudio Lotito and Lazio believed in me.
"I instantly had faith in the Lazio project and I fully supported the move," continued the custodian.
"It's the European Championship next summer and I'd like to be there with Italy. I want to do well for that reason too."