The in-form Doc, who has featured in all five games of 2004, nodded in his first goal since the 4-1 win over Sunderland in February 2003. The Irish international only made seven appearances in season 2001-02 following his leg break but, the season before, chipped in with six goals from central defence and hopes to get back to that level of contribution in future.
"It is something I've got to add to my game," he insisted. "When I first came on the scene I was scoring quite regularly from centre half.
"I've played five games in a row now and it's all been about defending for me, I've just been trying to keep my place in the team and help get good results with the rest of the lads.
"It's something I know I can do, get a goal here and there - I am delighted to get another FA Cup goal."
Gary admits that he did feel some sympathy for City goalkeeper Kevin Ellegard - due to the corner taking prowess of Helder Postiga.
"I felt so sorry for the keeper because Helder puts in such a good corner. I think him and Hasselbaink, the way they whip them in must make it a nightmare for keepers.
"I noticed quite early that he was going to miss it, so I was able to get up and just get over it and nod it in."
Gary's goal was due reward for a much improved second half performance at the City of Manchester Stadium - a far cry from a laboured first period.
"We were all over the place for some reason and just didn't get going. To be fair to them, they were playing at a hundred miles an hour, winning all the 50-50s, making it a cup tie - while we weren't competing at all.
"The second half, credit to us, we came out and I thought we ran the game. We were winning our tackles, the 50-50s and a draw was probably a fair result, although we had chances to win it.
"All credit to our fans, there were 6,000 of them and they really lit the place up in the second half. They really drove us on."
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Gary Doherty explained that he hopes to, once again, add goals to his game following his FA Cup leveller against Manchester City on Sunday.