Khatibzadeh made the comment on his twitter page on Saturday.
"Long-running relations of the Islamic Republic of Iran with Greece and its incredible people have always been based on mutual respect. These relations should not be disturbed through deeply short-sighted miscalculations, such as piracy, by order of a third party," he tweeted.
On Friday, Iran impounded two Greek oil tankers in Persian Gulf waters over maritime violations.
That happened several days after Greece detained an Iranian-flagged ship off its coast and began unloading its oil cargo.
Iran says Greek took the measure under US pressure.
Tehran also says that crews of the two Greek ships held in the Persian Gulf are safe and sound and protected in accordance with international laws.
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