The Australian will be hoping to earn a place in Ronny Deila's side for Sunday's contest.
The Watford goalkeeper was on hand to twice deny Saido Berahino from the spot as the Hornets edged to a 1-0 win over West Brom at the Hawthorns.
Everton are reportedly looking to land Mainz stopper Loris Karius as Tim Howard's replacement.
Eric Black has taken charge of the club's last three games following Remi Garde's departure last month.
West Ham United and Leicester City will face each other in the Premier League today.
The Tottenham owned star spent time on loan with Rangers this season.
Liverpool boss Jurgen Klopp is a popular figure at Anfield.
The 25-year-old earned his first Premier League clean sheet against the Swans.
The World Cup winner appears set to take over as new head coach, according to reports.
West Bromwich Albion lost against Watford in the Premier League on Saturday afternoon.