The Celtic striker knows he had to react in the right way to avoid a similar fate.
The former Hibernian striker couldn't make the grade at Celtic and was, in the end, limited to a handful of appearances before leaving the club.
And Griffiths is fully aware that it could have been him after his slow start to the current campaign. The 24-year-old found himself out of the first-team picture earlier this term and says it prompted a reaction. He is now Celtic's top scorer, having been named the SPFL's Player of the Month for April.
He explained: “Obviously you need to go and ask him [Riordan] what happened here. Things don’t obviously always work out the way you want them to. That could have been me. In October/November time when I wasn’t playing here, just like he had a time when he wasn’t playing here.
"You can maybe start thinking ‘the manager is not for me and I need to move on here.' That went through my mind but that is when I went to see the manager and JC [John Collins] and had a good talk with them."
Celtic travel to Aberdeen later today and confidence will be high within the Hoops' camp. Especially for Griffiths, whose current form is a far cry to his situation all those months ago.
The forward has well and truly proven himself with the Scottish champions - now to maintain that standard and take the next step up: impressing in the Champions League qualifying rounds and, should Celtic make it that far, the group stages.