Arsenal have to prioritise signing a defender in the upcoming January transfer window. Ahead of the winter market opening, Arsenal have been linked with a number of players. The majority of these mooted targets have been strikers or midfielders. It is easy to why this has been the case. Arsenal lack top class options who can lead the line. Gabriel Jesus is an excellent player, but is not the most prolific goalscorer and is injury prone. There are doubts over whether Eddie Nketiah has the quality to fire the Gunners to a Premier League title should he be required to lead the line for an extende…