Henry left the north London club this summer in a £16.1million switch to Barcelona after eight highly-successful years which saw him become the Gunners´ all-time top scorer.
And the Frenchman said: "I know the young players there very well and they can definitely win the Premier League and Champions League this season. I watched how they beat Sevilla in the Champions League and I think they sent out a big message to the rest of Europe. Sevilla is not an easy team to play, but Arsenal played a great game."
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