The 29-year-old, who signed an eight-month contract with the Blues in October, has now fully recovered after receiving surgery on a dislocated wrist.
Reports had suggested that Henson would not be ready to make his debut until later this month, but Cardiff backs coach Gareth Baber has hinted that he could feature against the Scottish club.
"He has a little niggle in his hamstring but in terms of his hand he is back to where he needs to be and he will be available going forward," said Baber.
"He will be in contention for the Dragons game and he is in contention for this week and could possibly be in the 23.
"He is a quality player and has had the time to get himself together and do his rehab properly, and hopefully when he makes his return he will be right on top of what he needs to do as I am sure there will be a lot of attention around him when he makes his debut for us."
Henson, 29, joined the Blues after a short spell with French club RC Toulon.