The former Old Firm and Scotland star is back in Canada preparing for the new MLS season after spending the winter keeping in shape at Rangers' Murray Park.
He has been linked with a third spell at Ibrox, despite the League One club's financial problems, but he says he's tired of denying he wants to re-sign for Rangers.
Miller said: "I've been in Vancouver 18 months and I don't think a month has gone by without those questions being thrown at me.
"I don't know what more I can actually do.
"If [Whitecaps] manager Carl Robinson wants to walk through and offer me a two-year deal right now, I'll sign it right here in front of you."
Miller has six months left of his Vancouver contract and is free to talk to other clubs.
But the 34-year-old, who quit international football last year, has made it clear he is desperate to win an extension to his current deal.
He said: "It has been made clear to me what I have to do to earn an extension so that's what I'm going to do.
"Part of the reason I retired from playing for Scotland was hopefully to concentrate fully on the Whitecaps and stay fit for as long as I can and give them everything I can.
"Going back and forth with international duty was becoming tough.
"And, like I said, I want to stay here and I would love to sign again."