Patchell's impressive displays in the RaboDirect PRO12 this season have led to calls for him to be handed a Six Nations squad berth in the light of Scarlets No.10 Rhys Priestland's Achilles injury.
Caretaker Welsh coach Rob Howley will name his squad on January 15 but while Davies believes his 19-year-old starlet has a considerable international future he's adamant a softly, softly approach is the only way forward.
For Davies, Patchell's only international experience this seasons should be in the Under-20 ranks.
"We [must] nurture him until he's ready to play for Wales, and at the moment he's not ready," he said.
"Rhys has got good mental qualities, he's very composed as a young fella. Physically he's developing, technically and tactically he's got a good grasp of it, but he's learning.
"We've got to make sure that we nurture him through things, and the experiences that he's getting with us at the moment I think are invaluable for him.
"If he goes and plays under-20s rugby, the Six Nations and the World Cup at that level is a fantastic experience for players.
"So I'm sure that would benefit him and at the moment the key thing is for him to keep developing physically, keep playing his rugby, keep enjoying his rugby and keep progressing him to make sure things don't get on top of him at an early age.
"That's the most important thing for me.
"I'll make sure he's looked after and he comes through and he'll be a massive asset for us and for Wales in the future.
"And once he gets in there [we must make sure] he has the tools to be able to stay there for a long period and be able to cope with it."
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