Brendan Rodgers is the favourite to answer Celtic's call and return to the club as manager following Ange Postecoglou's departure.
Postecoglou has left the Hoops to become the first ever Australian to manage in the Premier League, having agreed a four-year deal to take over as Spurs boss.
Rodgers managed Celtic to win two consecutive trebles before leaving the club to join Leicester in February 2019.