Edinburgh back Chris Paterson travelled to Poland on Wednesday to join the Scotland training camp in Spala.
Paterson underwent a pelvic scan on Tuesday but the results show he does not need surgery.
The full-back had to leave Scotland's recent Southern Hemisphere tour early after sustaining a triple fracture of the face in the defeat to Western Samoa.
Scottish Rugby's rehabilitation physiotherapist Stephen Mutch said: "The consultants who reviewed Chris were satisfied with the pelvic scan and we are now initiating a gradual programme of rehabilitation.
"Chris will be under the care of the Scotland medical team in Spala where the Scotland management are keen to have him involved on the planning front and to get his valuable input as a senior player."
As head coach Stuart Lancaster polishes the axe he will soon wield over his World Cup training squad, Exeter Chiefs coach Rob Baxter has backed Jack Nowell, Henry Slade and Luke Cowan-Dickie to be given a stay of execution.
Italy Under-20s held off a late Samoa blitz to retain their place in the World Rugby U20 Championship on Saturday and head coach Alessandro Troncon believes the experience will have served as a valuable lesson for his young troops.