Muntari said: "I didn't think twice about who was in goal. I just wanted to put the ball in the net and I was just concentrating on that. I was delighted to see it go in.
"All I wanted was to put the ball inside the net and I managed to do that so it was a good feeling."
Although the Blues midfielder smashed home his only previous spot-kick in the 7-4 win over Reading, this time it was all about precise placement.
Muntari said: "When you take a penalty, all you want is to score. It doesn't matter if the ball goes up or down, as long as it goes in. That was all I was thinking about and I am thankful I scored."
Muntari also heaped praise on boss Harry Redknapp for filling his players with the belief that they could beat United on their home patch.
The former Udinese man also told The News: "The manager told us if we came here and played our game, we could come here and get a result. We had to believe in that and show him we had that belief, too.
"We knew we had to be disciplined, but he gave us the courage."