Mohammed Rabiu hopes that he's come to the end of a two-year injury nightmare and is keen to earn a return to the Black Stars fold.
Columbus Crew SC completed the signing of Ghana defender Jonathan Mensah as a designated player on Tuesday.
Vrba has stepped down from the post following Czech Republic's group-stage exit at Euro 2016, where they finished bottom of Group D.
Anzhi Makhachkala has called for an end to "bigotry" in domestic football after its fans were abused by CSKA Moscow supporters.
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