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The manager explained: "He was struggling a bit with a kick in the first half and we took him off. He could carry on, but we chose not to take a risk." Gabriel Martinelli had previously put Arsenal ahead 1-0 following some excellent work from Viktor Gyokeres.
Following the match, goalscorer Martinelli shared his thoughts on Arsenal's win. "It's good for the club," he added.
We have a really good group. We want to win every title, and that's what we will try to do.