The family home of James DeGale was burgled on Sunday, and the robber allegedly stole the gold medal the British boxer won at the 2008 Summer Olympics.
DeGale said his MBE was taken as well.
"They are worthless to anyone other than me and they are two achievements that I prize from my boxing career," he wrote on Instagram. "I am gutted and need my medals back. Can anyone help by reporting any information you have. Please share far and wide."
DeGale also shared security footage of a person walking alongside his parents' home and covering the camera.