GLASGOW, SCOTLAND - DECEMBER 16: Celtic first team coach Harry Kewell before a cinch Premiership match between Celtic and Heart of Midlothian at Celtic Park, on December 16, 2023, in Glasgow, Scotland. (Photo by Craig Foy / SNS Group)

GLASGOW, SCOTLAND - DECEMBER 16: Celtic first team coach Harry Kewell during a cinch Premiership match between Celtic and Heart of Midlothian at Celtic Park, on December 16, 2023, in Glasgow, Scotland. (Photo by Craig Foy / SNS Group)

GLASGOW, SCOTLAND - DECEMBER 16: Celtic first team coach Harry Kewell during a cinch Premiership match between Celtic and Heart of Midlothian at Celtic Park, on December 16, 2023, in Glasgow, Scotland. (Photo by Craig Foy / SNS Group)

GLASGOW, SCOTLAND - DECEMBER 13: Celtic first team coach Harry Kewell before a UEFA Champions League group stage match between Celtic and Feyenoord at Celtic Park, on December 13, 2023, in Glasgow, Scotland. (Photo by Craig Foy / SNS Group)

GLASGOW, SCOTLAND - DECEMBER 13: Celtic first team coach Harry Kewell before a UEFA Champions League group stage match between Celtic and Feyenoord at Celtic Park, on December 13, 2023, in Glasgow, Scotland. (Photo by Craig Foy / SNS Group)

GLASGOW, SCOTLAND - DECEMBER 13: Celtic Coach Harry Kewell during a UEFA Champions League group stage match between Celtic and Feyenoord at Celtic Park, on December 13, 2023, in Glasgow, Scotland. (Photo by Craig Williamson / SNS Group)

GLASGOW, SCOTLAND - DECEMBER 13: Celtic Coach Harry Kewell during a UEFA Champions League group stage match between Celtic and Feyenoord at Celtic Park, on December 13, 2023, in Glasgow, Scotland. (Photo by Craig Williamson / SNS Group)

LENNOXTOWN, SCOTLAND - DECEMBER 12: Luis Palma and Coach Harry Kewell during a Celtic MD-1 training session at Lennoxtown Training Centre, on December 12, 2023, in Lennoxtown, Scotland. (Photo by Craig Williamson / SNS Group)

KILMARNOCK, SCOTLAND - DECEMBER 10: Celtic first team coach Harry Kewell (left) during a cinch Premiership match between Kilmarnock and Celtic at Rugby Park, on December 10, 2023, in Kilmarnock, Scotland. (Photo by Craig Foy / SNS Group)

LENNOXTOWN, SCOTLAND - DECEMBER 08: Harry Kewell during a Celtic training session at Lennoxtown Training Centre, on December 08, 2023, in Lennoxtown, Scotland (Photo by Ross MacDonald / SNS Group)

LENNOXTOWN, SCOTLAND - DECEMBER 08: Harry Kewell during a Celtic training session at Lennoxtown Training Centre, on December 08, 2023, in Lennoxtown, Scotland (Photo by Ross MacDonald / SNS Group)

LENNOXTOWN, SCOTLAND - DECEMBER 08: Harry Kewell during a Celtic training session at Lennoxtown Training Centre, on December 08, 2023, in Lennoxtown, Scotland (Photo by Ross MacDonald / SNS Group)

LENNOXTOWN, SCOTLAND - DECEMBER 08: Harry Kewell during a Celtic training session at Lennoxtown Training Centre, on December 08, 2023, in Lennoxtown, Scotland (Photo by Ross MacDonald / SNS Group)

PERTH, SCOTLAND - DECEMBER 03: Celtic Manager Brendan Rodgers looks relieved as he shakes hands with Harry Kewell as his side go 2-1 in front during a cinch Premiership match between St Johnstone and Celtic at McDiarmid Park, on December 03, 2023, in Perth, Scotland. (Photo by Craig Williamson / SNS Group)

EDINBURGH, SCOTLAND - OCTOBER 28: Hibs Manager Nick Montgomery and Celtic Coach Harry Kewell during a cinch Premiership match between Hibernian and Celtic at Easter Road, on October 28, 2023, in Edinburgh, Scotland. (Photo by Craig Williamson / SNS Group)

GLASGOW, SCOTLAND - OCTOBER 25: Celtic Manager Brendan Rodgers and Coach Harry Kewell celebrate as Celtic's Kyogo Furuhashi scores to make it 1-0 during a UEFA Champions League match between Celtic and Atletico de Madrid at Celtic Park, on October 25, 2023, in Glasgow, Scotland. (Photo by Craig Williamson / SNS Group)

LENNOXTOWN, SCOTLAND - OCTOBER 20: Celtic Manager Brendan Rodgers and Coach Harry Kewell during a Celtic training session at the Lennoxtown Training Centre, on October 20, 2023, in Lennoxtown, Scotland. (Photo by Craig Williamson / SNS Group)

LENNOXTOWN, SCOTLAND - OCTOBER 03: Harry Kewell during a Celtic training session at the Lennoxtown Training Centre, on October 03, 2023, in Lennoxtown, Scotland. (Photo by Paul Devlin / SNS Group)

LENNOXTOWN, SCOTLAND - SEPTEMBER 26: Harry Kewell is pictured at Lennoxtown, on September 26, 2023, in Lennoxtown, Scotland. (Photo by Alan Harvey / SNS Group)

ABERDEEN, SCOTLAND - AUGUST 13: Kyogo Furuhashi and Harry Kewell during a cinch Premiership match between Aberdeen and Celtic at Pittodrie Stadium, on August 13, 2023, in Aberdeen, Scotland. (Photo by Craig Foy / SNS Group)

ABERDEEN, SCOTLAND - AUGUST 13: Celtic's Kyogo Furuhashi and Harry Kewell during a cinch Premiership match between Aberdeen and Celtic at Pittodrie Stadium, on August 13, 2023, in Aberdeen, Scotland. (Photo by Craig Foy / SNS Group)

GLASGOW, SCOTLAND - AUGUST 03: Kyogo Furuhashi (L) and Harry Kewell during a Celtic training session at Lennoxtown, on August 03, 2023, in Glasgow, Scotland. (Photo by Craig Williamson / SNS Group)

LENNOXTOWN, SCOTLAND - JULY 31: Harry Kewell during a Celtic Training Session at Lennoxtown Training Centre, on July 31, 2023, in Lennoxtown, Scotland. (Photo by Craig Foy / SNS Group)

LENNOXTOWN, SCOTLAND - JULY 31: Harry Kewell during a Celtic Training Session at Lennoxtown Training Centre, on July 31, 2023, in Lennoxtown, Scotland. (Photo by Craig Foy / SNS Group)

YOKOHAMA, JAPAN - JULY 24: Celtic manager Brendan Rodgers and Harry Kewell during a Celtic training session at Marinos Sports Park, on July 24, 2023, in Yokohama, Japan. (Photo by Naoki Morita / SNS Group)