Arsenal have set their asking price for Shkodran Mustafi.
The polarising centre-back joined Arsenal from Valencia for £35m in 2016 and has divided supporters ever since.
Sections of fans clashed during Sunday's friendly loss to Lyon when Mustafi was booed after coming on as a substitute.
According to French publication L'Equipe, Monaco have enquired about the cost of signing the German international.
The Gunners want at least €30m to part ways with the error-prone defender.