Celtic are currently 19 points ahead of Ibrox side Glasgow Rangers in the Scottish Premiership standings.
Brendan Rodgers lost his first competitive match in charge at Celtic.
Stylian Petrov is part of the Aston Villa squad who have been training in Austria over pre-season.
Stylian Petrov made his comeback in Aston Villa training earlier today.
Aston Villa's under-21's take on Arsenal in the play off final later this evening.
Stylian Petrov made over 300 appearances for Celtic during his playing days.