A teaching union chief has warned that some school subjects will have to be axed as a result of the Scottish Government's budget.
Jim Thewliss, general secretary of the School Leaders Scotland union claimed the number of pupils per class would also rise, with teacher vacancies to remain unfilled.
Deputy First Minister John Swinney laid out the draft budget on Thursday, with the government saying it will work with local authorities to "protect what matters in Scottish society".
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Jim told BBC Scotland's The Sunday Show: "We are now at a stage where we really have a service where if you're going to start to cut any more you're cutting into the basic functions of the service, which is essentially the number of teachers in front of young people in schools.
"Vacancies which are already identified within schools, head teachers have been told these are not going to be filled."
He added that teachers across the country were expecting increases in class sizes and said some subjects would be removed if "deemed as non-viable".
He gave the example of higher modern languages subjects, which he said often had small class sizes of four or five pupils.
"We're now starting to find even greater pressure coming upon what is deemed as non-viable in terms of class sizes," the union chief told the programme.
He added: "We have bought entirely into the whole notion of young people having the best educational experience and the best life chances that they can have.
"We are now in the position of managing expectations to a degree. And I've no idea where we're going to move with this but it's becoming much, much more challenging in managing those expectations at the same time as promoting aspiration."
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