Geoffroy Serey Die ritorna a Basilea. Il centrocampista ivoriano lascia quindi dopo un anno e mezzo lo Stoccarda, retrocesso in 2a Bundesliga, per ritrovare i renani, con i quali ha giocato due anni a partire dal gennaio 2013, collezionando 69 incontri e due titoli. Il 31enne ha firmato per due stagioni più opzione per una terza.
Serey Die era arrivato in Svizzera nel 2009 a Sion. Con i vallesani ha vinto due Coppe Svizzere. Il grintoso giocatore vanta pure 22 selezioni con la sua Nazionale e ha partecipato ai Mondiali 2014 in Brasile.
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