The German international has been speaking about his time at the club.
Celtic boss Ronny Deila has been feeling the pressure recently. The Norwegian boss has been doing just fine in the Scottish Premiership but in European competition he has struggled to get his side going against tougher opposition.
Some have even been calling for his potential sacking after defeats against Molde recently.
The last Celtic manager to get the sack was Tony Mowbray back in 2010.
One of the players at that time has now been discussing the sacking of the now Coventry City boss this week.
Andreas Hinkel, was with Celtic for three years after joining from Sevilla in 2008. The now retired 33-year-old right-back, who has 21 caps for the German national team, has told the Scottish Daily Record:
“Mowbray wasn’t a bad Celtic boss. The football we played at the start of the season under Tony was very good. I enjoyed it.
“Ultimately Celtic managers are judged on their results and history shows they weren’t good enough under Tony.
“The bottom line is you have to get results at Celtic. If you are not achieving that then you have to change something.
“Five years ago Celtic were not getting the required results under Tony and that is why the club got rid of him.”
In terms of comparing Mowbray and Deila it is fair to say the Norwegian is in a better position. Whilst the former could not get results in the domestic theatre Deila is still looking set to take Celtic to a comfortable Scottish Premiership title this season.
As long as he doesn't lose the dressing room, then Deila should be sticking around for now.