He added: "We knew it was going to be a difficult match because Wolves have some good players who can score.
"The second half we had to be professional and sit the game out and not give a goal away."
But with Cardiff now in the last eight for the first time since they won the tournament in 1927, Hasselbaink is playing down the possibility of winning it.
"You have to take one game at a time," he said.
"If we can get a nice draw at home against maybe one of the Championship teams we've got every chance. It's in your own hands."
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