Burton boss Jimmy Floyd Hasselbaink said: "We are obviously aware that Oumar has been out of training for a while since he left Huddersfield.
"He's been training with us for a short period and has shown a lot of hunger and desire to get back playing.
"We know he's made over 50 Premier League appearances, and he's shown us that he can add something to the squad that we have – hopefully he'll be a good help for us to finish the season strongly."
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