A joint Mongolian-Japanese expedition found the giant print, which measures 106 centimetres long and 77 centimetres wide.
One of several footprints discovered in the vast Mongolian desert, the huge fossil was discovered last month in a geologic layer formed between 70 million and 90 million years ago, researchers said.
It was naturally cast, as sand flowed into dents that had been left by the creature stomping on the once muddy ground.
"This is a very rare discovery as it's a well-preserved fossil footprint that is more than a metre long with imprints of its claws," said a statement issued by Okayama University of Science.
The Japanese university has been involved in the study with the Mongolian Academy of Science.
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