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The striker was a prolific goalscorer for Hibernian in 2012/13 while on loan from Wolves, scoring 28 goals for the Edinburgh side. His performances saw him named PFA Scotland Young Player of the Year and the Scottish Football Writers' Player of the Year.
He returned to Wolves for the 2013/14 season and scored an impressive 13 goals for the Molineux side before making the move to the Scottish champions in the January 2014 transfer window.
He has also gained full international honours for Scotland.
Griffiths netted his first goal for Celtic in a 2-0 win over Hearts at Tynecastle, and followed that up with a hat-trick at home against Inverness Caley Thistle.