McCarthy, who has already had one spell in charge of his country, has led the Tractor Boys to 12th in the Championship.
"I'm not ruling myself in or out," he said to Sky Sports News.
"It might be that I'd just like to be asked so I can say yes. It might be that I'd just like to be asked so I can say no. I haven't been asked.
"I'm not asking for it, I'm not courting it, I'm not trying to do anything with it."
Ipswich's next match is away to Bolton Wanderers.