Williams set to return for Matildas
A thigh injury ruled Williams out of the Matildas' World Cup opener against United States as Australia suffered a 3-1 loss.
Veteran shot-stopper Melissa Barbieri was "amazing" – according to coach Alen Stajcic – in the defeat.
But Williams will be back if she can prove her fitness, with that change set to be one of up to four.
"If she's fit, she'll start the game. We'll see how she goes," Stajcic said.
"I thought 'Barbs' did very well the other day. Her distribution was immaculate, her composure at the back, when you look back at the game she did a couple of good takes on crosses as well and she did really well."
The Matildas meet a Nigeria outfit that drew 3-3 against Sweden in their Group D opener.
Stajcic said there was no need to panic just yet for the Matildas, with four third-placed teams to advance from six groups.
"There's plenty of minutes left in this World Cup in the group stages, still 180 and anything can happen," he said.
"The fact four third-placed teams go through, I don't think it's make or break on this one game.
"It's 270 minutes that gets you through, not any individual 90 minutes, so you've got to really be composed and mature and really understand your position.
"It's almost like a home-and-away tie in a Champions League. Nothing is done and dusted after 90 minutes and the World Cup is the same.
"There's three group matches and top two go through and those third-placed teams are crucial as well. Every goal, every minute counts."