The 20-year-old left-back plays with Griffiths for Celtic as well as for the Scotland national football team.
The 27-year-old is one of the best strikers in the Scottish Premiership and ended the 2018 World Cup qualifying campaign as Scotland’s first-choice striker.
The former Livingston and Dundee striker had injury issues last season and was also behind Frenchman Moussa Dembele in the pecking order at Celtic.
Griffiths has now established himself as a key figure in Brendan Rodgers’s side at Celtic Park, and has been among the goals both in the Scottish Premiership and in the Champions League this season.
Celtic defender Tierney has praised the Scottish striker, who has been on the books of the Hoops since January 2014 when he joined from Wolverhampton Wanderers in England for a transfer fee reported by The Daily Mail to be worth £1 million.
According to The Sun, Tierney, who is one of the best young left-backs in Europe, is valued at £15m.
“Leigh is brilliant,” Tierney told The Glasgow Evening Times. “He makes me look good!
“He is able to get the ball and make a chance out of nothing from some of the balls in that I give him and he is another one that I think has developed loads from playing in the Champions League."