The Gunners secured a record 42.5 million pounds deal for the German on transfer deadline day which has left Ronaldo frustrated. (Agencies)
"The sale of Ozil is very bad news for me," Ronaldo was quoted as saying in a Spanish paper.
"He was the player who best knew my moves in front of goal. I'm angry about Ozil leaving," he said.
"It's obvious that he is a special team-mate and friend. I've always had a real 'feeling' with him, and it's a shame. He's a great footballer, unique," Spain and Real Madrid defender said.
"Ozil would be the very last player who I would sell from Real Madrid, if it was up to me. I don't understand this," he added.
The German playmaker said that he didn't want to leave the Spanish club but had no option left when the coach and club bosses had lost faith in him.
Ozil became the London club's most expensive player in a club record deal. German manager Joachim Low also expressed his surprise at Real Madrid letting go of Ozil.
"Many Real players like Sami Khedira or Cristiano Ronaldo are sad about the transfer," he said.
"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," he added.
It seems that was not longer 100 percent there at Real whereas Arsenal and their coach Arsene Wenger pulled out all the stops to get him," said Low.
The Gunners secured a record 42.5 million pounds deal for the German on transfer deadline day which has left Ronaldo frustrated.