Sept 17 (Reuters) - China's Luckin Coffee is

set to announce later this year an agreement with Brazil to buy

some $2.5 billion worth of coffee from the South American

country's producers, a Brazilian official said on Tuesday.

"We have already negotiated the next Luckin Coffee

announcement, they want to disclose it at the time of the G20

summit," the head of Brazil's APEX association, Jorge Viana,

told an event alongside President Luiz Inacio Lula da Silva.

The G20 leaders' summit will happen in Rio de Janeiro in

November. Luckin had in June announced a deal to buy $500

million worth of coffee from Brazil, the world's largest coffee

growing and exporting country.