The tight-head prop has emerged as an unlikely candidate to be part of Warren Gatland's touring party next summer after producing some impressive displays during Ireland's autumn internationals, including Saturday's 27-24 victory over Australia in Dublin.
England's Dan Cole, Wales' Samson Lee and Scotland's WP Nel are all expected to rival Furlong for a place in the squad, but the Leinster forward does not believe he is yet ready to be considered for Lions selection.
"It's kind of daunting in a way, to be honest with you," said prop Furlong of links to next summer's Lions squad. "The Lions is synonymous with such a big brand and so many great players have played there. Do I see myself there at the minute? No.
"I think I have a long journey to go and, as I said, I've only started four games for Ireland, two Heineken Cup games for Leinster and it is a big, big step to be making those shouts."
The Lions will take on New Zealand in a three Test series next summer with the first match taking place in Auckland on June 24.