The Sweden international recently penned a new deal with the Toon.
"They were a bit optimistic. I feel that I have a few years left abroad before that issue will be brought up," Krafth told Fotbollskanalen.
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"They probably tried to make a 'fouling' and were a little optimistic. But I feel that I am not ready abroad."
The 29-year-old admits that MFF checked with his agent.
"Yes, they checked with the agent. I don't think it was more than that," he added.