The pair are Argentina teammates and Higuain has helped Di Maria settle quickly since his arrival from Benfica.
"He's a player who brings a presence to the wing, which is something that we lacked a little last season," said Higuain. "And he also has speed, technique, acceleration ... Di Maria can contribute much to this club. He is a great boost and allows us to play more on the wings."
On the criticism of Di Maria's signing, Higuain added: "Everyone has their opinions and should be respected. But we all have great confidence in him and hopefully he can shine on the field all the qualities he possesses."