Playing Christie would appear to be a major gamble, but Herbert has been impressed with his output since he came back into the fold in the past few months and the 30-year-old could perform a close marking role in midfield.
Whether Herbert goes for Sigmund or Vicelich at the back, the All Whites will struggle to contain Mexico.
Reid was the quickest NZ defender and neither of the two replacement options is blessed with pace.
The other conundrum comes up front, in what Herbert admits may be his toughest decision.
It's the one where the All Whites have genuine options and at this stage Chris Wood, Jeremy Brockie and Kosta Barbarouses are believed to have the inside running.
However, it would be hard to leave Marco Rojas out, given his obvious talent, while Shane Smeltz has been at the centre of many of the big moments in recent years. Rory Fallon's aerial prowess and presence is also a wildcard.