The France striker had a disappointing first season at the Nou Camp following his £16million switch to Barcelona from Arsenal last summer.
Kevin Keegan named him the player he would most like to sign this summer, but Sir Alex Ferguson tried to be the 'early bird'.
Man Utd Tried To Sign Keegan's No One Target!
Barca coach Frank Rijkaard has left the club after a trophyless season.
Guardiola has taken the reins at the Catalan giants, and is believed to have talked Henry out of a £10million switch to Old Trafford.
The Sunday Mirror quotes a source as saying: "Thierry was told by the new coach he didn't want him to leave, that he was going to be a big player for Barca next season and would have an important role to play for them.
"That reassured Thierry - but United were ready to buy him."