Tom Rogic's Celtic will be watching intently as Caltex Socceroos teammate and Hibernian attacker Martin Boyle entertains title rivals Rangers in the Scottish Premiership on Saturday morning (AEDT).
Hibernian fell to a 2-0 defeat against Celtic last weekend, who have a five-point lead over Rangers at the top of the table.
Hibernian host Rangers this weekend while Celtic play third-placed Aberdeen.
Wins for both Rogic and Boyle this weekend will open up an eight-point gap between Celtic and Rangers at the top of the table in what will be an entertaining weekend of Scottish Premiership football for our two Caltex Socceroos stars.
Meanwhile, Aaron Mooy and Mat Ryan face a stern test in the English Premier League as Brighton and Hove Albion host Sheffield United at AMEX Stadium on Sunday morning (AEDT).
Newly-promoted Sheffield have excelled throughout the start of the Premier League campaign rising to seventh in the standings after 17 games.
But Mooy and Ryan carry a solid streak of form into the clash having gone undefeated in three games, including a stellar away win over English giants Arsenal in early December.
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Caltex Socceroos Massimo Luongo, Kenny Dougall, Bailey Wright, Jackson Irvine and Adam Federici are all preparing for huge clashes in the English Championship this weekend, with their respective games all holding serious implications for both the playoff and relegation scraps.
Dougall’s last-placed Barnsley enjoyed a thrilling 5-3 win over Queens Park Rangers last weekend which brought his side closer to the teams above battling to avoid relegation this season.
Dougall played the full 90 minutes in central midfield fin their entertaining win over QPR and will look forward to lining up against 11th-placed Milwall on Sunday morning (AEDT) with a win on the road crucial for Barnsley to continue their climb out of the relegation zone.
In a similarly precarious position is Adam Federici’s Stoke City, who come into a clash with Middlesbrough on Saturday morning (AEDT) two points and two positions above Barnsley in the English Championship standings.
At the other end of the table meanwhile, two Caltex Socceroos will collide when Luongo and Sheffield Wednesday face Bailey Wright’s seventh-placed Bristol City on Sunday night (AEDT).
Wednesday sit one point ahead of Bristol in fifth place on the table with Fulham sandwiched between the two sides in sixth, giving extra importance to earning all three points as the Sheffield club look to make a spot in the playoffs their own.
Jackson Irvine is the fifth Caltex Socceroo involved in English Championship action this weekend when his 14th-placed Hull City take on Birmingham on Sunday morning (AEDT).
Birmingham sit directly beneath Hull in the standings in 15th, giving Irvine and co. the chance to create a five-point buffer between the sides with a win at home.
One league below is Caltex Socceroos defender Harry Souttar, who is preparing to face Rotherham with his side Fleetwood Town in Enlgish League One on Sunday morning (AEDT).
Fleetwood currently sit in ninth place on the table but have the chance to make some ground on those above them as they come up against sixth-placed Rotherham who are only one point ahead of Souttar’s side.
In Turkish football, Caltex Socceroos full back Aziz Behich's Istanbul Başakşehir head to Kayserispor on Monday morning (AEDT), having progressed into the last 16 of the Turkish Cup on Friday.
Trent Sainsbury’s Maccabi Haifa are second in the Israeli Premier League and will be aiming to extend their 10-game undefeated streak with a win over Sektzia Nes Tziona in the Israel State Cup on Sunday morning (12am AEDT).
Rounding out the European action for Caltex Socceroos abroad this weekend is Apostolous Giannou who comes up against AC Omonia – the current leaders of the Cypriot First Division – with his side AEK Larnaca on Monday morning (AEDT).
Giannou and Larnaca snapped a three-game losing streak when they beat Pafos 1-0 last Saturday and come into the clash with AC Omonia in sixth position.
Closing out the action are a number of Caltex Socceroos preparing for stern tests in the Hyundai A-League this weekend.
Jamie Maclaren became the fastest player to 10 goals in a Hyundai A-League campaign last weekend reaching double figures in just his sixth appearance of the season.
He'll be hoping to continue filling his boots against Melbourne Victory on Saturday afternoon (5pm AEDT).
Newcastle Jets midfielder Dimitri Petratos travels to Perth with his side hoping to end their two-game losing streak.
Andrew Redmayne and Rhyan Grant kept a clean sheet for Sydney FC last weekend but will face a stern test against Wellington Phoenix on Saturday (2:45pm AEDT).