Celtic may have signed 12 new bodies for the first team after Ange Postecoglou was made their new manager but there have been some riveting stories of former players in recent weeks.
Odsonne Edouard moved south of the border on transfer deadline day and with his very first touch of the ball, scored on his debut for Crystal Palace.
The Frenchman would net another in their win over Spurs on that same day but Olivier Ntcham and Kristoffer Ajer have also thrived.
Ajer was part of the Brentford squad who sealed a win over Arsenal during their first Premier League outing while Ntcham was in sensational form for Swansea last week.
The Swans were losing 3-0 at half time but his introduction saw the game end 3-3 as he registered a goal and an assist.
However, there is a forgotten man out in America who is very much stealing the show.
That happens to be Patryk Klimala, a player Celtic signed for £3.5m in the winter window of 2020.
The Polish striker was extremely average at Parkhead and struggled to find form, scoring just three goals in 28 appearances for the Hoops.
A move away this year was hardly surprising as the 23-year-old kick-started a mass clear out at Paradise.
He is now playing for the New York Red Bulls in MLS where he’s enjoyed a wonderful revival and is certainly showing what Celtic are missing.
Albian Ajeti has had his own mini-comeback at Celtic with three goals in his last three outings but that could so easily have been Klimala.
The Hoops did, at least, recoup the money they paid 19 months ago and for the American side, that’s now looking like a bargain.
During 2021, Klimala has found the net seven times and also picked up five assists for his new club in 20 outings.
That makes for impressive reading, especially when you consider that he’s scored in three successive games now.
What’s also intriguing is that he scored against Ronny Deila in the early hours of Wednesday morning.
The ex-Celtic manager is now in charge of New York City FC but he witnessed heartbreak as his team drew 1-1 courtesy of a penalty kick from Klimala in the 12th minute of injury time after a VAR review.
So often used to being the man who was put out to pasture in Glasgow, his fortunes have drastically changed and improved since finding a new home.
Head Coach Gerhard Struber has been delighted with him since his arrival, commenting: “Patryk with his outstanding movements and with his pace, it’s not easy to handle.”
He is now one of the leading lights for the Red Bulls and is relishing his rise to stardom in America.