"It's been long overdue, I'm delighted to have scored, but it's a team game and we performed really well," the 28-year-old told BBC Radio Stoke.
"The lads showed great character and it was a great performance from us."
He added: "From the first whistle we were up for it, we stopped them from playing, which we knew had to do."
Whitehead said that a lot of the credit should go to winger Matthew Etherington, who set up the goal with a terrific cross.
"Matty's been doing that all season, I couldn't miss," he said.
Two goals from Ricardo Fuller and a late third from Whitehead booked a tie against Manchester City in the fifth round of the FA Cup.
The Potters have to wait until Monday, 1 February for their next Premier League game, when they play Whitehead's former club Sunderland at the Stadium of Light.
Source: BBC Sport
Source: BBC Sport