The summer signing from Barcelona B is currently on-loan at Southend, but his fresh start is being hampered by niggling injuries. He has only been able to play 10 minutes of action for The Shrimpers since joining in November.
The Spaniard has only made two appearances for Sunderland since joining - getting sent off 2 minutes into his first start. Since then, Arnau had to settle for a place in the reserves and has since gone on loan to Southend in order to gain some experience.