Paraguayan President Horacio Cartes said in August that his country would join the shared bid by neighbours Argentina and Uruguay, which hosted and won the inaugural World Cup in 1930.
Cartes met with his Argentine and Uruguayan counterparts, Mauricio Macri and Tabare Vazquez, at the presidential palace in Buenos Aires yesterday to finalise the announcement.
"The first meeting (for the bid preparation) will be organised in the first week of November," Cartes said. "Other countries are going to want to host but there is a very strong argument in favour of Uruguay, which will celebrate 100 years" since it staged the first World Cup.
Vazquez revealed it took him "less than 40 seconds" to agree to the joint proposal with Argentina when it was first suggested following a visit to Uruguay by Macri in January 2016. Macri said the subsequent decision to include Paraguay came equally as quickly.
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Macri is a former president of top Argentina football club Boca Juniors, Vazquez was president of Uruguayan side Progreso, and Cartes is an ex-president of Paraguayan outfit Club Libertad.
South America last hosted the World Cup in Brazil in 2014. The bidding process is not due to open for several years yet, but any bid for 2030 is likely to face stiff competition from the Asia region, where China is expected to be the front-runner to stage the finals.
Both Uruguay and Argentina have won the World Cup twice before, with Uruguay taking the inaugural tournament and again in 1950.
Argentina won the tournament in 1978 on home soil, and again in Mexico in 1986.
The next World Cup takes place in Russia, with Qatar staging the event in 2022.
A joint United States-Mexico-Canada bid is the favourite to host the 2026 tournament, with only one other country, Morocco, having entered the bidding race.