The European Union is postponing the signing of a free trade deal with four Mercosur countries until January, an EU official said on Thursday.

The agreement between the EU and Brazil, Argentina, Uruguay and Paraguay, which has been in the making for over 25 years, was scheduled to be signed at a summit in Brazil on Saturday.

The controversial free trade deal is intended to boost trade between the economic blocs, but is viewed critically by some major EU countries including France, Poland and Italy.

Italian Prime Minister Georgia Meloni, however, said that her government would be ready to back to deal as soon as the European Commission delivers more reassurances to farmers.

Italy's support is required to reach the necessary majority of at least 15 of the EU's 27 states, representing 65% of the bloc's population, backing the deal and to pave the way for its signing.