The 29-year-old is one of a trio of Italians to have made the move to Welford Road, being joined by Robert Barbieri and Michele Rizzo.
Ghiraldini has won 67 Test caps and played in all five of Italy's 2014 RBS 6 Nations campaign.
He will face stiff competition for the starting jersey at the Tigers from England's Tom Youngs but Ghiraldini believes it will help him develop into a better player.
"Every big club has a lot of good players. If you want to be a part of a great club, you have to challenge against big players," Ghiraldini told the Leicester Mercury.
"That is why we are a big club. If you join a big club, you know that you have to work harder than at another club. But I love it. I really love to work hard.
"Every player has to have the attitude to improve every day. Every morning when I come here, I want to improve myself in every single part of the game.
"I am quite experienced but you have to show every time that you are a good player.
"I want to be a better player so I love the challenge that there is here."
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