Can you post a copy of his player page? Like to see his numbers.
If he's ready for the bigs, I'd call him up and see if he really is ready. If not, send him back down. It starts his clock early, but my thought's on that have always been - if he turns into a good player, I'm going to wind up paying him big $$$ anyway. If I have to do it a year sooner, meh, so what. You're just building a franchise, I can't imagine you're over burdened with long term high value contracts, so if you wind up signing him a year sooner, you should have the money. Right about the time you're ready to be competitive, or shortly after.
G/L whatever you decide.
Maybe update this thread in a couple months (game time) to let us know how he's doing.