Hiroshi Aoyama will assess the condition of his fractured wrist at the start of MotoGP's forthcoming pre-season test at Sepang.
The 31-year-old Japanese rider suffered his injury when he fell while training on a motocross bike at a Barcelona circuit in January.
His recovery is taking longer than expected, and MotoGP specialist Dr Xavier Mir has advised him to keep it unstressed for a further week in order to speed the healing process.
That could compromise his participation in the first test of the season, which runs from February 3-4 for CRTs only and then for a further three days with the MotoGP prototypes.
CRT squad Avintia confirmed Aoyama as a full-time rider in 2013 in November last year.
2013 MotoGP pre-season testing
Sepang* 3-4 February
Sepang 5-7 February
Sepang 26-28 February
Austin** 12-14 March
Jerez 23-25 March
* Only open for CRTs ** HRC private test