Dayot Upamecano "cannot be a leader" according to Holger Badstuber, who says the young defender will need support at Bayern Munich.
Upamecano will bring his impressive four-year spell at RB Leipzig to an end when he moves to Allianz Arena this summer.
Bayern saw off competition from a host of top European clubs to broker a €42.5 million (£36m/$50m) deal for the Frenchman, but Badstuber has moved to temper expectations surrounding the centre-back.