The former Scottish first minister will be in the Belgian capital to collect the first Coppieters Award.
A spokesman for Mr Salmond said last week that he would meet Mr Juncker ahead of the awards ceremony.
It comes as the Scottish government prepares to publish its proposals for keeping Scotland in the single market after Brexit.
Mr Salmond's successor as first minister and SNP leader Nicola Sturgeon met Mr Juncker in Brussels in June.
Speaking at the time, Mr Juncker said Scotland had "won the right to be heard in Brussels" and that he would listen carefully to what Ms Sturgeon had to say.
But he stressed that he would not "interfere in an inner British process".
The request for a meeting with Mr Juncker was made by Mr Salmond, who will receive the Coppieters Award in recognition of his "dedication and advocacy for Scotland's right to redefine its political future among a European family of nations".
The Scottish government is exploring potential options for keeping Scotland in the European single market even if the UK as a whole leaves, with its proposals expected to be published next week.
The EU has previously said it will only negotiate a deal with the UK government once Article 50 is triggered and the formal process of leaving the EU begins.
The UK Chancellor, Philip Hammond, said earlier this month that a special Brexit deal for Scotland was "not realistic".
He also said he wanted to work closely with the Scottish government and the other devolved administrations in order to "secure the best possible deal" for all parts of the UK.

Northumbria University told Newcastle Crown Court it was "deeply, genuinely sorry" as it was fined £400,000.
Sports science students Alex Rossetta and Luke Parkin were each given the equivalent of 300 cups of coffee.
They were admitted to intensive care for dialysis after the calculation error led to violent side-effects.
Prosecutor Adam Farrer told the court the overdose "could easily have been fatal".
Peter Smith, defending, said the university wished to "emphasise that they take the welfare of their students and staff seriously".
The students had volunteered to take part in a test in March 2015 aimed at measuring the effect of caffeine on exercise.
They were given 30g of caffeine instead of 0.3g, Mr Farrer said.
Death had previously been reported after consumption of just 18g, he told the court.
The university had switched from using caffeine tablets to powder, he said.
"The staff were not experienced or competent enough and they had never done it on their own before," he said.
"The university took no steps to make sure the staff knew how to do it."
The calculation had been done on a mobile phone, with the decimal point in the wrong place, and there was no risk assessment.
Both men have made a full physical recovery, though Mr Rossetta had reported short-term memory loss, the court heard.
The university admitted the health and safety breach at a hearing last month.
Alex Salmond is expected to meet European Commission president Jean-Claude Juncker in Brussels later.
[NEXT_CONCEPT]
A university has been fined after two students suffered "life-threatening" effects when they were given 100 times too much caffeine in an experiment.