If either man - and, for that matter, Glen Moss, Leo Bertos or Jeremy Brockie - find themselves in harm's way against the Glory, the All Whites' already-intimidating task at Estadio Azteca will grow even more daunting.
Both centre-backs could be required to line up alongside Ipswich's Tommy Smith in the heart of a three-man defence in the first leg of a tie which will determine New Zealand's World Cup fate.
However, neither man can afford to flinch for a Phoenix side without a win in four matches.
Sigmund and Durante - set to surpass Tony Lochhead's club record for appearances - won't be the only ones whose minds may wander during the match.
Their coach has cause to be bit preoccupied, too. Ernie Merrick was forced to miss training late this week after learning his family home in Melbourne had burned down.
The house had been rented out to tenants and Merrick was expected to return to Christchurch in time to take the reins, but it was an unnecessary distraction for a man still searching for a maiden victory at the club.
Perth may be ideal opposition to end that search, considering the Phoenix emerged with two wins and a draw from three meetings between the teams last season.
Shane Smeltz will again be the dangerman, though the All Whites striker could also play with caution considering he only recently returned from injury.APNZ