The move is a further indication that Henson is being strongly considered to start at full-back in Wales' opening RBS 6 Nations fixture against Ireland on February 4.
With Shane Williams, Lee Byrne and Mark Jones all injured, regular full-back options Gareth Thomas and Kevin Morgan could be pressed into action on the wing.
And Jenkins is known to want more of a kicking option from his full-back - something Henson would provide in spades.
Henson began his international career as a full-back but most of his rugby in recent years has come almost exclusively at either fly-half or inside centre.
Ospreys head coach Lyn Jones agreed to the move after a meeting at the Millennium Stadium yesterday, where Jenkins gave a detailed presentation to coaches and representatives from all four regions.
Jenkins was outlining a blueprint he believes will not only lead Wales to glory at this year's World Cup but lay the foundations for continued long-term success.
He wants Wales and the regions to develop an integrated, long-term partnership for their mutual benefit.
"If we all work towards a common goal then we will be stronger," he said.
In the short term Jenkins revealed a mission statement designed to lay out boldly and confidently his goal to win the World Cup in Paris.
The mission statement reads simply: "The Welsh Way...Winning 20.10.2007."
Jenkins explained: "I want to coach a team that can win the World Cup. It can't be an empty mission statement.
"I think we have a better chance of winning the World Cup this year than ever before. We are setting our sights high.
"To win the Six Nations and the World Cup we will have to create the right environment and sometimes play beyond our best - but that is what champion teams do.
"To a man the players are setting their sights on winning the World Cup quarter-final for the first time since 1987 and then going for broke in the semi-final."
And Jenkins will take his side into the World Cup playing the exuberant, breathless rugby which won them the 2005 Grand Slam and for which, as a nation, they are so famous.
"There is nothing new about the Welsh way. The game is all about scoring tries and that is what Welsh players like to do," he said.