The 22 year-old midfielder joined the Spanish outfit on loan last season and joined on a permanent deal at the end of last season for a fee of around 6 million euros.
But after making just 3 starts in all competitions this season, it seems that the Brazil international could be tempted to move away if he can be guaranteed more playing time.
Inter Milan are trying to produce a team which will get back to the Champions League in a financially healthy state and the addition of Casemiro is ideal as he fits the mold of their new transfer structure.
Arsenal are in need of a physical midfielder who can keep the team on track in the middle of the park and see Casemiro as the perfect option.
Casemiro would be valued at a price of around 15 million euros which both teams should be able to pay without an reluctance.