U.S. stock futures are falling on worries over China's economic growth and whether Greece can entice enough private creditors to participate in its bond swap.

Dow futures are down 47 points at 12,921. The broader Standard & Poor's 500 futures fell 6 points to 1,363. Nasdaq 100 futures are 11 points lower at 2,633.

Economic reports due Monday include data on orders to factories and on the health of the service economy.

On Monday, China's premier Wen Jiabao lowered the economy's growth target to 7.5 percent from the 8 percent it has stood at for years.

Further weighing on sentiment is a worry that Greece's bond swap may not be going according to plan, with particular concerns over participation by the private sector. Results are due late Thursday.