Griffiths is arguably the best striker in the Scottish Premiership at the moment and has been scoring goals for fun this campaign.
The 25-year-old former Wolverhampton Wanderers man has scored 32 goals in all competitions so far this season, including two against Inverness Caledonian Thistle at Celtic Park in the Premiership at the weekend.
Former Celtic striker Cascarino believes that Griffiths’s failure to get into the Scotland team despite his great form underlines a major problem in Scottish football.
“Just how bad is Scottish football?” the former Republic of Ireland international striker wrote in The Times. “It’s a pretty poor reflection of the quality north of the border when Leigh Griffiths can show what appears to be Ronaldo-like form and score 32 goals for Celtic yet he is not even good enough to get into a Scotland team that failed to qualify for Euro 2016.”
Celtic are at the top of the Scottish Premiership table at the moment with 61 points from 26 matches. The Glasgow giants are six points clear of Aberdeen, who are currently second in the standings.
The Bhoys will return to action on Friday evening when they take on Hamilton Academical away from home at New Douglas Park.