The controversial European Commission President is expected to say very little about Brexit despite clashing with the UK over its plans to leave the EU.
Mr Juncker has previously called for “more Europe” to fix the EU’s problems, but this approach has fanned the flames of Euroscepticism across the Continent.
This year the EU seems to have a renewed sense of optimism and Mr Juncker is expected to paint a bright vision of its future during a big speech tomorrow.
The European Commission President’s career could be defined by the State of the Union address at 9am local time in Brussels (8am BST in the UK).
Brexit is just one of the many problems facing the EU as Hungary and Poland as fight back against centralised initiatives on migration and the rule of law.
After the EU referendum, Jean-Claude Juncker defended himself against criticism and rejected accusations that he was an undemocratic “faceless bureaucrat”.
“I’m sad after this vote in the UK and I make no secret of it,” the EU boss told the European Parliament in late June 2016.
“I’m not a robot, I’m not a machine, I’m a human being, I’m a European and I have a right to regret the result of the British vote.”
Of the EU’s future, he added: “The British vote has cut off one of our wings as it were, but we still fly on. Our flight continues.”
Mr Juncker, 60, served as Luxembourg’s Prime Minister for nearly two decades before resigning over a secret service scandal. He denied any wrongdoing.
The eccentric politician, from Luxembourg, has faced accusations of heavy drinking in the past. He took charge of the European Commission – the EU’s executive branch – in 2014.
At the time, David Cameron tried to block Mr Juncker’s appointment saying that he could not deliver EU reform amid “huge disquiet” about the way the EU works.
Mr Cameron said: “Jean-Claude Juncker has been at the heart of the project to increase the power of Brussels and reduce the power of nation states for his entire working life.
“He is not the right person to take this organisation forward.”
Mr Juncker has taken a tough line on Brexit and was a key player in the renegotiation of Britain’s membership, which led to a insubstantial deal in February 2016.
His red lines in talks were the integrity of the single market and the EU’s ‘four freedoms’, plus the possibility of bringing more of Europe into the Eurozone.
The ‘four freedoms’ – the free movement of goods, services, capital and people – mean that goods can move freely and EU citizens can live and work in any member state.
Concerns over immigration and the free movement of people defined the EU referendum debate and led to triumph for the Brexit campaign.