Arsenal are in the market for a new central midfielder, and they have been linked with several options. Amadou Onana and Bruno Guimaraes are among those linked, and both would cost a substantial figure, with some doubts over whether either are the right fit for what Mikel Arteta wants in his midfield. Arsenal want a midfielder who could replace Thomas Partey at the base of midfield and allow Declan Rice to push further forward. Martin Zubimendi has been linked, but he may not want to leave Spain. A bargain option may have now presented himself to Arteta, as Monaco midfielder Youssouf Fofana wi…