THIS is the Prime Ministerial letter that helped convince Italian superstar Alessandro Del Piero to bring his considerable talents to Sydney.

With the biggest deal in Australian soccer history in the balance, Sydney FC chairman Scott Barlow and chief executive Tony Pignata had to pull out something special to snare Del Piero.

So the call was made to the highest office in the land.

Prime Minister Julia Gillard accordingly penned a letter to FFA boss Ben Buckley that in turn was forwarded to Del Piero in Turin.

"I know the Football community and indeed all Australians would join me in extending the warmest welcome to Mr Del Piero to Australia," The Prime Minister said.

"Football in Australia continues to go from strength to strength, and I know Mr Del Piero would inspire an entire generation of young Australians to get involved in the game at a critical time in its growth.

"I hope Mr Del Piero is able to give favourable consideration to joining the game here and I hope your discussions reach a fruitful outcome with him."

The letter proved to be a stroke of genius, with Del Piero left in no doubt about how highly valued his services were in Australia.

Barlow and Pignata - along with the man who brokered the deal, agent Lou Sticca - travelled half way around the world to Del Piero's home town of Turin to sign the Italian superstar.

The letter ensured their journey wouldn't be in vain.

"I know a player like this will make an enormous difference to the game - to existing fans across the country, and hopefully to a new generation of fans." The Prime Minister told The Daily Telegraphlast night.

FFA boss Ben Buckley was over the moon at Del Piero's decision to sign a two-year deal with Sydney FC.

"The Prime Minister has been a wonderful supporter of our sport and again her support made all the difference," Buckley said.

"It can't be underestimated the impact of a player of Alessandro Del Piero's stature has on the game in this country. Del Piero's move gives the A-League a huge endorsement. It will pave the way for other players of his stature to make the trip to Australia.

"It will provide a legacy for football in this country for many years to come."

Del Piero's arrival is expected to generate a significant buzz for Australia and the local competition but could also help the economy of his countrymen. The Italian tourism office confirmed they will look to anchor new campaigns around Del Piero to increase visitation from Australian travellers.