Germany manager Joachim Low has described Real Madrid's decision to sell Mesut Ozil to Arsenal as "incomprehensible".
The Gunners completed a £42.4m deal for the Germany midfielder, 24, on Monday following Real's signing of Gareth Bale from Tottenham.
But Low has questioned the decision to allow Ozil to leave the Bernabeu.
"For me, it's incomprehensible that Real would sell one of their top scorers," Low said.
"Many Real players like Sami Khedira or Cristiano Ronaldo are sad about the transfer."
Low feels that Ozil will benefit at the Emirates from the determination Arsenal manager Arsene Wenger showed to secure his signing.
The Germany manager, whose team face Austria in a World Cup qualifier on Friday, claims that the Gunners' style of football, as well as Wenger's support, will bring the best out of the former Werder Bremen midfielder.
He added: "Mesut is a sensitive player and he needs the faith from the club and the coach.
"It seems that was no longer 100% there at Real, whereas Arsenal and their coach Arsene Wenger pulled out all the stops to get him.
"He has a top coach there and, with Lukas Podolski and Per Mertesacker, he has two German colleagues. Arsenal are a strong team who play technically high-quality football."