Speaking to Danish outlet Fotboll Skanalen, Gravesen said: "It is incomprehensible to me that he chooses Malmo. It is not a club that he can go to because he cannot sign a contract with them and we have some clubs in Denmark that are much, much better than Malmo.
"This looks like a friendly thing, where Christian Eriksen is over and having fun with some friends. Where is the ambition to play football?
"We talk about him being without a club for three months, but he has been without a club since January because he has been able to sign a contract with a new club ever since. He has been dragging his feet on it for a long time.
"If he wants to play for the national team, what signal does this send? What signal does going up and having fun with friends in Malmo send?
"I don't understand it. It seems frivolous in some ways. If he had ambitions, he would have gone to a higher-level club.
"For me, it is not ambitious enough to go to Malmo and have fun. Who sees him there?"