Messi is currently off contract and while he has agreed terms over a new five-year deal, he cannot put pen to paper due to wage cap concerns.
But De Jong told Sport: "He played and won the Copa America and it ended on July 11.
"It is normal that he is still on vacation and I hope he will come back to us soon.
"He's the best player in the world, without him here, it's very different."
Need a VPN? Or seeking to switch? Then support Tribal Football by clicking here to sign up with our official partners NordVPN. Not only will you receive the best VPN experience, but also great discounts by signing up via Tribal Football. Thanks for your support!