Arsenal manager Unai Emery is keen to bring in two more players before the end of the transfer window, but the north London side will have to sell players first in order to raise funds.
The Gunners have already secured the services of Bernd Leno, Lucas Torreira, Sokratis Papastathopoulos, Stephan Lichtsteiner and Matteo Guendouzi in recent weeks and Emery remains keen to add to his squad.
Arsenal had a £70 million ($91m) budget heading into the transfer window, however, and will have to sell before making any additional signings.
They are believed to be willing to listen to offers for the likes of Nacho Monreal, Shkodran Mustafi, Danny Welbeck, Petr Cech, David Ospina, Carl Jenkinson and Lucas Perez.