On-loan from Chelsea, Jackson took aim at his parent club after the triumph.
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Jackson said, "It wasn't easy, but we played a very good game and worked hard. I'm very happy to score my first goal for the club.
"I'm still getting back to full fitness because I hadn't played and trained alone for two months. I'm working hard every day."
Jackson was referring to being frozen out in preseason by Chelsea manager Enzo Maresca after the Club World Cup.
He added, "I'm very happy here, everyone welcomed me very well. I feel home. We'll see what the future brings."