Tottenham have completed a deal for Cologne defender Kevin Wimmer and he will join them in June, Sky sources understand.
Liverpool give U21s more game time than Premier League rivals but top flight lags behind Europe.
Wolfsburg finished as runners-up to Bayern Munich as they wrapped up their campaign with a 2-2 draw at Cologne.
Mainz ensured their place in the Bundesliga next term with a 2-0 win over Cologne, who guaranteed their safety a week ago.
Cologne secured their top-flight status for next season with a 2-0 victory over Schalke.
Bas Dost scored twice as Wolfsburg secured a Champions League spot, while Cologne guaranteed survival.