Guardiola was full of praise for Gabriel afterwards, particularly after the Brazilian missed a number of good chances in Wednesday's win over West Ham.
“We wanted to push [for a winner]," Guardiola said.
“Gabriel always brings intensity. He missed three clear chances against West Ham because he didn't shoot, and today he shoots.
“That's what I want from strikers. Go and shoot. Always you make substitutions for the best of the team.
“We [managers] are brilliant because they score, and we are not brilliant when they don't score – but it does not work that way.
“Managers do substitutions to improve, to do something that can add to the team, avoid mistakes. Always there is one idea."