The defender is on-loan from Liverpool and impressed in victory over Bristol City.
"Nat is a big add to us, he gives confidence in the defence and organises the defence," said Cardiff manager Bulut.
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"Other players next to him are acting on it and that's important. He has played for Liverpool and Celtic, big teams, and he knows when you get pressure how to stay calm.
"He gives this to the other players too and with (goalkeeper) Ethan (Horvath) there now we can also play better from the back."