Henderson was called on by the Mariners as injury replacement for Jess Vanstrattan who seriously injured his knee at training last week.
Nash becomes the third keeper on the books at EnergyAustralia Stadium but Neil Young is still recovering from illness and injury which has kept him out for months.
Nash has just completed NSW Premier League season with APIA Leichhardt and Jets coach Branko Culina was happy to bring him in as reinforcement.
"I watched him play a couple of game for APIA and obviously had him at Sydney FC," Culina said.
"We need an experienced goalkeeper and I'm fairly confident he will be fine.
"He is certainly the best keeper in the NSW Premier League."