The 28-year-old has not played rugby since going on unpaid leave from the Ospreys 18 months ago following the latest in a series of injury setbacks.

Saracens have not yet revealed the length of Henson’s contract with them, or when he might make his debut.

He trained with his new club for the first time earlier this week.

Henson is currently appearing on the BBC's 'Strictly Come Dancing' series, a commitment that could last until Christmas.

Saracens say they recognise Henson’s ongoing commitment to the programme, adding: “The player’s path back to full match fitness will dovetail with his participation in the show.”

Henson, who won the last of his 31 Wales caps during the 2009 Six Nations Championship, said he was “genuinely delighted” to be joining Saracens.

“They have created a special vibe at the club, and to be honest, just being around them has rekindled my enthusiasm for the sport,” he said.

“They are bold and innovative, and they’re positive and ambitious.

“I know I still have so much to give to rugby, and I can’t wait to get back on the field, playing for Saracens and hopefully for Wales.

“Now it’s time to start working hard, getting back to match fitness as soon as possible and then to let my rugby do all the talking.”