Patrick Vieira‘s side were not at their best but still had chances to win the game.
Vieira started with summer signing Odsonne Edouard up front before replacing him with Belgian striker Christian Benteke, who missed a golden opportunity when heading wide from yards out after Wilfried Zaha had crossed to the far post.
Leeds goalkeeper Illan Meslier also made a scrambling save to deny the substitute after he wrong-footed him from Jordan Ayew’s delivery.
Asked whether teammate Benteke should have scored his chance, Gallagher said: “Yeah, [he] could have.
“I should have done better as well because I was in a good position just before the header so we had a few good chances.
“We had chances to win the game for sure, we want to be winning these games. They made it hard for us and pressed well. Another day we could have come out with a win.”