It is understood that no offer for the 24 - year - old German centre - back has yet been made to the Spanish club .
The Gunners are also in talks to sign Valencia defender Shkodran Mustafi , Sky Sports reports .
Sky Sports is understood that no offer for the 24 - year - old German centre - back has yet been made to the Spanish club .
The Gunners are also in talks to sign Valencia defender Shkodran Mustafi , Sky Sports reports .