His goal was superbly taken, swept in from Mason Mount's clever cutback, and proved to be the 28-year-old's second winner of the season.
"This is one of the reasons why the coach brought me on so I have to be happy to score that decisive goal," he told the club's website.
"It was a difficult game from the beginning, not easy from the first minute, and it was not our best day but the most important thing is we got three points. All the other stuff is better to forget."
Ziyech added: "We were always trying to find the spaces and we knew our moment would come. That's also one of the strengths of this team because no matter if we play good or bad, we always find a way to score.
"During a season, you know you can't always play good but the most important thing when you don't is to win the games and today was a good example of that. It's always good to stay top of the table and I think we also deserve to stay there right now."
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