Kungiyar kwallon kafa ta Bulgaria Montana, ta tabbatar da daukar Gabriel Kalu.
Kungiyoyin biyu ba su bayyana tsawon lokaci da kudin canja wuri ba.
Kalu ya koma Montana daga sabuwar kungiyar kwararrun kwallon kafa ta Najeriya da ke Sporting Lagos.
Dan wasan tsakiyar mai kai hari ya taka rawar gani a Sporting Lagos zuwa NPFL a kakar wasan da ta wuce.
Dan wasan ya ki amincewa da damar buga wa Rivers United wasa.
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