The 23-year-old stood out in Aironi's Heineken Cup matches last term and has been included in the Italy squad for forthcoming matches with Argentina, Canada and the United States.
Saracens director of rugby Mark McCall is confident Romano will add depth to the team's front-row stocks.
McCall said: "Lorenzo made an impact for Airioni last season and was recently included in the Italy squad.
"He is a young prop with immense potential, and we are looking forward to providing an environment where he can develop into one of the leading prop forwards in Europe."
And Romano is confident his career will come on leaps and bounds with the move to Vicarage Road.
"Saracens is a dynamic and ambitious club, and I am very pleased to have this outstanding opportunity," Romano said.
Gilbert has released a new line of rugby cleats. The Gilbert Virtuo 8S is part of the exciting new product. Check it out.
The entire All Blacks apparel line has been updated for 2013/14. Check out the New Zealand All Blacks polo.
The Nike Tiempo is a solid rugby cleat and one of few styles still made from full-grain natural leather.
The Gilbert Blitz 8S rugby cleat is a great cleat at a great price of $69.99. Get a new pair of cleats today.
A cool looking all black rugby cleat with the high performance adidas is known for. Get in the Gear!
Wear the crest of the British and Irish Lions on your t-shirt. A great look for the summer.
The All Blacks Performance t-shirt is black with hints of blue from the training jersey. Very Cool.
The New Zealand All Blacks training jersey for 2013/14. Get in the Gear!
The USA Rugby Pro Alternate rugby jersey is perfect for any fan of the Eagles. Get yours to wear during the summer Test matches.
The NEW All Blacks 2013/14 jersey has arrived at World Rugby Shop. Dare to wear the colors of the All Blacks.