RB Leipzig are inviting offers for young defender Dayot Upamecano.
The Frenchman is contracted to Leipzig until 2021 but has so far refused to sign an extension.
Arsenal are believed to be among a host of clubs keeping tabs on the situation and sporting director Markus Krosche admits Leipzig are braced for bids before the transfer window closes.
"Dayot is currently one of the best defenders in the Bundesliga, so it would surprise me if no clubs came knocking for him," he said.
"He's certainly an attractive player for the big clubs in Europe but he can still take a few steps forward and develop with us."