His showings at the heart of the midfield have impressed Cazorla, who is currently sidelined through injury.
The Spaniard said: "He's a superb signing for Arsenal, a player who arrived with a lot of humility and wanting to do something important.
"He's a different player with bits of genius.
"Madrid's president has done great things for the club by signing spectacular players.
"Sure there will be people upset about it, but without knowing more than what I read, they have their reasons."
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