The Arsenal manager has confirmed Henry, the club's all-time record scorer, will sign for the Gunners on a two-month loan deal if insurance agreements can be agreed with current club the New York Red Bulls.
Henry scored 226 times in 370 appearances for the club before moving to Barcelona in June 2007.
Sol Campbell was released from his contract at Newcastle by Mike Ashley on May 25th this year, and has yet to find a new club.
Arsene Wenger: "Sol was fantastic when he came back. Sol is like Thierry. Once they are committed you know you can rely on them.
"I remember when we went to Tottenham, Sol was absolutely amazing for a guy who, three weeks before, you wondered if this guy can still play in the Premier League.
"He had such a capacity to fight. They have that pride. Now we have Thierry, it is a continuity of the special link with our former players.
"You do not find players on the planet of this quality who are available for two months.
"You can never take away from people what they have done, that will remain forever. Nobody expects him to be what he was 10 years ago.
"He is here to help out, not to suddenly be the leader, the main player in the squad. He and I are conscious that he is 34 years old, but he has not lost his class or his brain.
"The players are all happy that Thierry is coming back. You can always learn in life from people who have the knowledge like he has."