The device hasn't delayed construction and is thought to be a World War II remnant, RIA Novosti reported Monday. Germany bombed Moscow in late 1941 and early 1942.
"Stadium employees are awaiting the arrival of specialists in defusing aerial bombs," stadium construction officials said on their website. "A police cordon is around the bomb."
The stadium is scheduled for completion next year, officials said.
2014: The Year in Music [PHOTOS]