Lewis, who was with Wales on their two-Test tour of Japan before flying to Australia to follow the Lions, admits the tour to the Far East was a loss-maker, but is part of the "ecology" of international rugby.
"With the British and Irish Lions this is something we are gently looking at now," said Lewis.
"The first thing is to understand all of the dynamics around it [a Lions tour], and I know the British and Irish Lions are doing that themselves and understanding what their costs are and the benefits.
"It is something that does need to be looked at now because the game has taken off since the last great Lions win in '97.
"In 2001, 2005 and 2009 [Lions tours]... it was very different from the world we are in now, so the world has moved on and now is the time to look at it afresh."
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