Jeremy Corbyn will make the socialist case for a Remain vote when he visits Aberdeen today.
The Labour leader will argue that a “Tory Brexit” will risk workers’ rights and lead to a “race to the bottom”.
Polls indicate the EU referendum is neck-and-neck, although the Remain side has been persistently ahead in Scotland.
The Press and Journal reported this week that 92% of fisherman intend to Vote Leave, with the Brexiteers recently opening a campaign base in the Granite City.
But speaking ahead of his visit to the north-east, Mr Corbyn said a “reformed European Union” was the best option for working people.
He said: “There are 12 days until people across Scotland go to the polls to vote in the EU referendum.
“What is clear is that if you want to remain a part of the EU you need to get out and vote for it on June 23.
“There is a positive, optimistic case for voting to remain in a reformed European Union.
“Being part of the European Union gives us the ability to tackle the big challenges that we face as a nation – challenges that don’t respect national borders like dealing with climate change, tackling tax avoidance and standing together to avoid a race to the bottom on workers’ rights.
“The Leave campaign cannot provide answers to working people who are asking serious questions about what a Tory Brexit will mean for their jobs and their families’ future.”
Mr Corbyn has faced criticism for not campaigning hard enough ahead of the June 23 vote.
But he has hit the campaign trail in recent days amid fears Labour voters are unenthused by the Remain campaign.
He added: “Labour has made the case for reform of the European Union, with allies across Europe, but tens of thousands of people in Scotland haven’t made up their mind about this referendum yet.
“We need to carry on making the positive case and showing people that their rights at work and their future is best secured inside a reformed European Union.”
Tom Harris, a former Glasgow Labour MP and director of Scottish Vote Leave, said: “I’m disappointed to see Corbyn repeating his new shadow cabinet-approved line on the EU, namely that we should vote remain.
“What a pity he won’t be advocating his real view, and the one he’s been voicing for more than 30 years – specifically, that we should leave the EU.”
The Labour leader will help man a street stall this morning on St Nicholas Street, before visiting a cafe.