But China can still overcome economic problems, Li said in a speech last yesterday at the Central Party School, which trains cadres, according to a notice on the cental government's website.
Gross domestic product (GDP) in the world's second- largest economy grew at just 6.9 per cent in the third quarter, its slowest rate in six years.
In March, Li forecast 2015 economic growth would be about 7.0 per cent, as the country shifts to a "new normal" driven by domestic consumption instead of exports and government investment.
China's most recent GDP figures added to fears over the health of the global economy, and some analysts expressed concern they had been manipulated to understate the gravity of the situation.
But Li attempted to strike an optimistic tone about the future.
"The joint efforts of the whole country and the great potential of China's economy, strengthens our confidence in overcoming difficulties," according to paraphrased remarks posted on the central government's website.
Even though growth has eased in recent years its GDP more than doubled in real terms between 2006 and 2014, according to World Bank figures.
Now it is looking to transition to a "new normal" of slower and more sustainable expansion driven by domestic consumer demand, but the change is proving bumpy and stock exchanges around the world have been pummelled in recent weeks by concerns over its future.
