FC Energie Cottbus has finalized a spectacular transfer: Leonardo Bittencourt is returning to the Lausitz from SV Werder Bremen.[1009555] Kevin McKenna will join the 1. FC Köln coaching staff as a co-trainer, bringing René Wagner a familiar face in his team.[982310] Union Berlin has signed Marvin Friedrich, an inside defender who previously played for Mönchengladbach and is returning to the club.[978345]