Borussia Dortmund intends to sign the Greek defender in Stuttgart Konstantinos 

International press reports revealed that Borussia Dortmund is seeking to strengthen the team's defense line with a new player, as many injuries hit the club and has suffered since the end of last season. 
Press reports confirmed that Borussia Dortmund is showing interest in signing the Arsenal defender Konstantinos Mavropanos. 
Reports added that the Greek defender is spending the current season on loan in Stuttgart, who is entitled to buy him for 3 million euros, according to the contract clause.
it is expected that Stuttgart will activate the purchase clause, targeting to sell it for at least 25 million euros. This comes in light of the interest of Newcastle and West Ham are all showing interest in out-on-loan Arsenal defender Konstantinos Mavropanos
Newcastle United and West Ham clubs to sign Konstantinos in the winter Mercato, which is on the doorstep.