“I´m over the moon,” he said. “It´s been a long time coming. Ever since I heard Celtic were interested there was only one place I wanted to play and I´m just glad it´s done now.
“It was the middle of December and my agent gave me a phone and said Celtic could be interested in January and I have just been counting down the days.
“Unfortunately, it´s taken to the last day but I´m just glad that it´s been done now and I can´t wait to get started.
“We are the Scottish champions to begin with, and this is a massive club with a massive fanbase and a massive stadium. I have watched the Champions League nights on the TV and there is no better place to play. This is where I want to be.
“I was just really keen. I know what it takes to become a Celtic player. I had a great season last year at Hibs and then I have went down back the road and started scoring goals as well.”
Griffiths struck 28 times for the Easter Road side during the previous campaign in which he underlined his qualities as a natural-born finisher, scoring every type of goal. Nothing gives him greater satisfaction.
“I want to bring goals – that´s what I am all about and what I love doing,” he said. “I did it last season for Hibs and have done it for Wolves and now it´s my time to shine in the Hoops and hopefully I can do it.
“I am just thankful to get my chance here and hopefully I can prove that I am a good signing and start scoring goals for fun.
“My message to the fans is that I´m looking forward to playing and scoring goals and winning things here.”