The striker has made six appearances for Darren Ferguson's Preston since signing on a temporary basis in August.
King, 18, was surprised to be sent on loan by United boss Sir Alex Ferguson, the father of Darren, at such an early stage in his career and he does not know where he will be playing come the conclusion.
"I didn't think I'd be going out on loan this early, I thought maybe it might happen after Christmas," King told the Lancashire Evening Post.
"When the boss at United told me Preston wanted to take me on loan, it was a bit of a surprise. But I'm glad I came here, I'm enjoying it.
"I'm on a three-month youth loan as it stands, I don't know what is going to happen after that.
"United are monitoring me here, I still go back there sometimes to do a bit of extra finishing work with Ole Gunnar Solskjaer, who coaches the reserves."