The striker failed to make much of an impact during his time with the Scottish Premiership side.
Teemu Pukki during his time with Celtic
Teemu Pukki has explained that while he enjoyed his spell at Celtic, the physical nature of the Scottish game and the way that opponents looked to play against the Hoops contributed to the largely disappointing time that he endured at Parkhead, The Scottish Sun reports.
The 26-year-old joined the Bhoys in 2013, and while it would be two years before his permanent departure, he spent almost all of his second season with the club out on loan with the side with whom he remains today, Brondby.
Pukki scored just seven goals from the 26 league appearances he made for Celtic. And ahead of his return to Scotland as part of the Brondby side that will take on Hibernian in the first leg of their Europa League second qualifying round tie on Thursday, the Finland international suggested why he was unable to live up to expectations at his former club.
"It was not so easy for me in Scotland in general. I didn't really adapt to Scottish football well, but I enjoyed my time there," he told The Scottish Sun.
"The physical nature and the pace of the game was a big thing, and many of the teams defended really deep against Celtic so there was not so much space to run in behind.
"That's a big part of my game, so that was one thing as well."
Pukki's task of showing what he is capable of when he takes to the pitch at Easter Road will be slightly tougher given that he will be coming up against a manager that will already know him well in new Hibs boss Neil Lennon.
The Northern Irishman was the man who brought the forward to Celtic Park, so may have an idea about what his defence will need to do to keep him quiet during the game.
But while Thursday's tie will give Pukki the chance to go against his old boss, if Brondby get through and Celtic fall at the next stage of their Champions League qualification campaign, then he may be presented with the opportunity to prove himself to his old side in the next round.