Chelsea have joined Arsenal's interest in VfL Wolfsburg defender Ridle Baku.
The Germany international fullback has attracted enquiries from the Gunners over the past month.
However, BILD says Chelsea are also keen.
And Wolfsburg are preparing to part with Baku this summer, with a starting price of 13m.
Baku's deal doesn't carry a buyout clause, but VfL are now willing to sell.