Ben Davies says he had to fend off Matt Hill to be United's matchwinner on Tuesday night.
Referee Mike Dean had pointed to the spot in the 90th minute after Craig Morgan was adjudged to have fouled Harry Maguire and Davies claimed possession of the ball and headed to the penalty spot.
But en route a handful of team-mates expressed their interest in taking the spot-kick.
The 32-year-old, who duly stroked home from twelve yards to take the derby spoils, joked: "I don't know whether the other lads really wanted it or if they were just showing the Gaffer a bit of bravery!
"I got hold of the ball first, but that Matt Hill came sprinting towards me...there was no way he was having it though.
"The Gaffer asked me before the Brentford game if I wanted penalties if Jose (Baxter) wasn't on the field and I am confident from dead balls.
"We practised penalties after training on Monday with the FA Cup semi-final in mind, so hopefully scoring this one is a good omen."
Looking back on the game itself, Davies praised the younger members of United's squad.
The Derby loanee added: "You know what you are going to get with Rotherham and they fight from the first minute to the last.
"They are direct at times and you have to be willing to compete for every second ball, but it was a good game, a typical derby and a fantastic result.
"The youngsters were brilliant, the Gaffer will give them a chance and they certainly impressed. Let's not forget Rotherham entered the game on the back of a 16-game unbeaten run."