"This year's economic growth target will be around 7 percent, but the 7 percent should be the bottom line," said one of the sources, an influential economist who advises the government.
"The government will have to balance economic growth, employment and structural reforms this year," said the economist, who requested anonymity due to the sensitivity of the matter.
Read MoreChina economy grows at slowest pace in 24 years
The use of "around" to qualify the growth forecast repeats terminology used last year by authorities to show they were not fixed on a hard target.
Although the target was endorsed in December, it is still possible for it to be adjusted before the parliament convenes.
The State Council Information Office, the public relations arm of the government, had no comment on the growth forecast when contacted by Reuters.
Officials have said slowing growth reflects reforms to put the economy on a more sustainable path, but they are wary of a sharp slowdown that could cause job losses and debt defaults.
China's pursuit of rapid growth in recent decades has helped fuel overinvestment in some sectors and a sharp build-up of debt by local governments. Almost $7 trillion was wasted on ineffective investment since 2009, a government official and economist said last year.
Central Bank Governor Zhou Xiaochuan has acknowledged a lower growth target was on the cards for 2015, saying it would be discussed by the parliament in March.
The government is also looking at lowering its forecast for consumer price inflation to around 3 percent, the sources said.
Consumer prices rose 2 percent in 2014, coming in well below a target of 3.5 percent as deflation fears intensified, while producer prices have been falling for almost three years.
"Fighting deflation could be the top priority in the near term, but that won't contradict with structural adjustments," said another source, who is a senior economist at a well-connected think-tank in Beijing.
The last time China set its national growth target at 7 percent was in 2004, when theeconomy actually grew 10.1 percent. The growth target was 7.5 percent last year.
Data last week showed growth in the world's second-largest economy plumbed a 24-year low of 7.4 percent in 2014, and a Reuters poll of more than 40 economists found growth was expected to slow to 7 percent this year and 6.8 percent in 2016.
Some local governments have already lowered their growth targets for this year, often after significantly undershooting their 2014 goals, and Shanghai said it would not even set a growth target because its focus was on reforms and developing a free-trade zone.
Fifteen of 17 regions, provinces and municipalities, including Beijing, that have released local growth plans for 2015 have cut their GDP targets by between half a percentage point to 2.5 percentage points from last year, local media reports and government websites showed.