Manchester United are monitoring Mats Hummels' situation at Bayern Munich.
BILD says Hummels could become an option for United with his Bayern future reportedly at risk.
The German defender has previously been a target for United, having turned them down in 2014.
United are in need of defensively reinforcements and Hummels could fit the bill for manager Jose Mourinho in January.
Hummels' future at Bayern is in doubt having become part of the club's rotation system under new boss Niko Kovac.
A move away from the Allianz Arena is said to be a consideration in the coming months - with United one of the biggest clubs in the world looking for a new centre-back.