Back in 2013, Arsenal pounced on one of the greatest market opportunities of all time when signing Mesut Ozil from Real Madrid. The Spanish giants were not expected to sell the German maestro that summer, but after splashing £85m on Gareth Bale – a world record fee at the time – the sale was made. Players at Real Madrid were shocked. Alvaro Arbeloa famously admitted that he thought Mesut Ozil was joking when he said goodbye to those in the Santiago Bernabeu dressing room, while Sergio Ramos claimed the playmaker would be the “last to be leaving” if he was in charge. Now, Real Madrid might be a…