Communities Minister Éamon Ó Cuív confirmed the funding, which is in addition to the grant of €2.75m allocated by the Department of Arts, Sports and Tourism earlier this year.
"This stadium will be a huge boost for Tallaght," said Minister Ó Cuív.
"And this project is particularly significant in that it will serve three different RAPID areas - Fettercairn, Killinarden and Jobstown.
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"I understand that this stadium will be home to Shamrock Rovers FC, the most successful club in Irish football history, and this will be an inspiration for many young players in Tallaght.
"I am confident that Tallaght Stadium will contribute greatly to this sense of community in Tallaght, and I am looking forward to seeing the plans for this new stadium when I announce the full list of RAPID Sports Capital Top-Up Programme allocations in Tallaght," added the Minister.
Hoops' Chairman Jonathan Roche welcomed the news: "This is great news for Shamrock Rovers and the people of Tallaght."
The club chairman said the investment illustrated the benefits sport can bring to local communities, and the support would provide a great boost to professional football in the area.
"It's a unique and all-encompassing package that reflects the club's determination and ability to make a positive impact on the lives of people in Tallaght," he said.
(PR/JM)
