The Premier League new-boys have spent over €140m so far this summer on new arrivals including Granit Xhaka and Habib Diarra.
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Now Sky Deutschland says Sunderland are lining up a move for Belgium international Openda.
Leipzig are prepared to sell - though are insisting on €60m to part with the centre-forward.
Last season, Openda boasted a record of 13 goals and 11 assists in 45 matches. At RBL, his contract runs to 2028.