Bayer Leverkusen are chasing Manchester United defender Marcos Rojo.
The Daily Mail says Rojo was expected to leave in the summer with Monaco among those interested but a deal could not be agreed.
Jose Mourinho is still keen to add a new centre-back and selling Rojo will make room for a January arrival.
Leverkusen bought Javier Hernandez from United for £7.3million in August 2015 and the Mexican has proved an astute acquisition despite a recent goal drought.
Leverkusen have progressed in the Champions League but have had a disappointing Bundesliga season so far, lie tenth in the table and want to increase competition throughout the squad.