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That's right. The 32-year-old forward, who has scored once for Austria in this summer's European Championship, is convinced that the pair are here from another planet to take all the trophies and dominate their respective leagues.
You can watch the brilliant press conference moment below:
Speaking to the media ahead of Austria's round of 16 clash against Italy on Saturday night, the former West Ham striker was asked about five-time Ballon d'Or winner Ronaldo, who netted twice against France in Group F on Wednesday.
He then brought his great rival Messi into the conversation.
"When it comes to Ronaldo, we're not talking about a human being. What more can I say about him?" Arnautovic said.
"For me, they are two players who come from a different planet. They have come from somewhere completely different.
"They have arrived here for a short time to stir up all the leagues and competitions, taken all the trophies with them and then quit. That's him and Lionel Messi."
Arnautovic isn't the only player to question whether Lionel Messi is human or not.
He said: "I always said that Messi has some talent that no one has. I mean, he has the ball and his speed controlling the ball. The ball doesn't go two metres far from his foot, it's always there. It's impossible to catch him. This talent I didn't see from anyone.
"Cristiano Ronaldo is such a different player, they are very different. He is tall, strong, he's really complete. He can do anything. He can do goals with the head, free-kicks, penalties, take one on one.
"But for me it's like Messi is not human, but Cristiano is the best of the humans."
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Featured Image Credit: PA
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