Athletics Integrity Unit, AIU announced on Thursday that the doping laboratory in Tokyo has made an unfavorable finding in Ujah's doping test according to AP.
His test should contain the banned and muscle-building substance ostarine.
If the 27-year-old is found guilty, the British team will lose their silver medals.
The AIU also announced that the 1500 meter runner from Bahrain Sadik Mikhou, the shot putter Benik Abramyan from Georgia and the Kenyan sprinter Mark Otieno Odhiambo have been temporarily suspended after positive doping tests in Tokyo.