Middlesbrough boss Aitor Karanka is wary facing Mesut Ozil in their FA Cup tie with Arsenal.
The pair worked together at Real Madrid.
Karanka said: "He's a very good lad. I spent three seasons with him - he's an amazing player and I hope on Sunday he doesn't have his best day.
"I hope he can rest for the league they have some important games coming up! But it's not just Ozil, it's Cazorla too. They have a lot of [dangerous] players."
For the big stories and the banter follow us on Twitter: @tribalfootball