Arsenal may face a potential problem in the transfer market as some of their more sellable assets have lost value. Arsenal have been poor at selling players over the years, with a lot of heavy investment signings walking away from the club for free. Despite spending over £200m on Nicolas Pepe, Mesut Ozil, Pierre-Emerick Aubameyang and Alexandre Lacazette combined in the past, all four players ended up departing for free after their values plummeted. Arsenal’s transfer success has improved dramatically under Mikel Arteta and Edu Gaspar’s transfer strategy, which sees them analyse targets in exc…