"The decision of President [Alexander] Lukashenko on releasing jailed opposition leaders creates conditions for suspending the sanctions. This will be discussed on September 4-5," the diplomat said.
Some EU countries have called for suspending the sanctions against Minsk for at least a year.
EU foreign policy chief Federica Mogherini and Johannes Hahn, the commissioner for European neighborhood policy & enlargement negotiations, earlier said the prisoner release marked "important progress towards the improvement of relations between the EU and Belarus."
Lukashenko announced a decision on August 22 to pardon and free ex-presidential candidate Nikolay Statkevich and a number of other jailed opposition figures whom the EU has called "political prisoners."
Statkevich was convicted in 2010 and sentenced to six and a half years in jail for staging mass disorders in December that year after the presidential elections in Belarus.