Low said that it was a bad move by Real to sell one of their best players, but admitted that Ozil would perform for Arsenal as he will feel wanted in North London.
"Many Real players like Sami Khedira or Cristiano Ronaldo are sad about the transfer," Low told reporters. "For me, it's incomprehensible that Real would sell one of their top scorers.
"Mesut is a sensitive player and he needs the faith from the club and the coach. It seems that was not longer 100% there at Real whereas Arsenal and their coach Arsene Wenger pulled out all the stops to get him."
The fee that took Ozil to Arsenal was a club-record £42.5m.