The former Liverpool captain was making his competitive home debut for the Bees.
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Henderson said after the 1-0: "I'm delighted with the result. I think the boys gave everything. It's a great day for us and I'm glad Dango Ouattara scored in his debut.
"It's nice to be back. I've been missing the Premier League for the past few years. It's the best league in the world and I enjoyed every minute of the fight.
"I know it won't be easy for us this season, but there are so many good people in the club. With the kind of performance and passion we have shown for each other, we can move in the right direction."