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He was speaking after a Moody's analyst said on Tuesday Turkey would enter a recession next year unless it agreed to a programme with the International Monetary Fund (IMF).
"I do not attach value to what the credit rating agencies say. The crisis showed they are not subject to supervision," Caglayan told reporters when asked about the Moody's comments.
Investors and business leaders want Turkey to agree a new loan accord to support the economy after the expiry in May this year of a $10 billion stand-by accord.
Senior government sources told Reuters on Tuesday Turkey's gross domestic product was seen growing by 2 percent in both 2008 and 2009.