Henry was the focal point at Arsenal and their top scorer in four of the five Premier League seasons between 2001-06, though he spent much of the last campaign sidelined with injury.
He turned down a move to Barca and signed a four-year contract with Arsenal after they lost to Frank Rijkaard's team in the 2006 Champions League final in Paris.
Now at Barca, Henry faces the prospect of having to find a place in the one of the most feared forward lines in European football, which includes Cameroon striker Samuel Eto'o, Brazil playmaker Ronaldinho and Argentina winger Lionel Messi.
Image: Henry goes through a medical test at the new club.