The two sides meet in the Champions League on Tuesday.
The Gunners meet Barcelona in the Champions League on Tuesday, with the reigning champions travelling to the Emirates for the first leg of the last 16 clash.
Arsene Wenger’s side have not enjoyed a strong history against the La Liga giants, having only managed one victory in their last seven meetings.
Many are predicting that run to continue given how the Catalans are playing at this moment in time, but Henry has told his side how they can win the game regardless.
"They have to accept they will probably only have 30 per cent possession and must be so efficient when they do get the ball,” he told the Sun.
“The whole team must defend more as a unit and the wingers must tuck in and play more in their own half.”
"Arsenal must be brave on the ball. They need to stay compact, play on the counter and score every time they get in their penalty area.”
If Arsenal are to progress over the two legs, getting a positive result at the Emirates will be key to their hopes.
It is not a wholly unachievable feat either, with them having enjoyed a 2-1 success when the two sides last met in 2011.
That result proved fruitless though as they were beaten 3-1 at the Nou Camp to crash out of the competition and they will likely be eyeing a better result to try and ensure the same doesn’t happen this time around.