Weak Chinese manufacturing data "started sort of a downturn of the Chinese stock market and then that spilled over to the U.S. stock markets. I am not that concerned about that in terms of the U.S. economy," Mester said in an interview with Bloomberg television.

"We've built in a weakening path for China. I don't see that as a significant risk to the forecast" for the U.S. economy, she said.

(Reporting by Jason Lange and Lindsay Dunsmuir; Editing by Chizu Nomiyama)