It's another massive test for Ange Postecoglou on Thursday in the Europa League.
Celtic kick-started their group stage campaign at Parkhead against Ferencvaros, and now it's time for the return fixture in Hungary.
The Australian will need a win to keep aspirations of reaching the knockout stage alive.
Having dominated the Hungarian champions in Glasgow's east end, they must take three points to keep pace with Group G top two Real Betis and Bayer Leverkusen.
Defeat would put the chance of third and a Europa Conference League spot in jeopardy.
Postecoglou put his players through a final session on Wednesday at Lennoxtown ahead of they jet off.
Here are five things we spotted from the session.
Kyogo mixes it up
There is no doubt that Kyogo Furuhashi has been a smash hit since arriving at Celtic.
Since his summer switch from Vissel Kobe, he has netted 10 goals and earned his spot as a Parkhead cult hero.
He also remains a Japanese footballing icon and is idolised in his native country for following in Shunsuke Nakamura's footsteps and flying the flag for his homeland at one of the biggest clubs in the UK.
So, it's safe to say that a few people will be following the trends set by this man.
The 26-year-old has now unveiled a new look as ahead of Celtic's trip to Hungary to face Ferencvaros.
Fans won't be able to miss the attacker if he is handed a start by Ange Postecoglou with his new bleach blonde locks.
COP a load of this
Ahead of big European away days, Celtic always train at Celtic Park.
However, the impact of the climate change conference COP26 has meant that tradition has been broken.
The Celtic Park car park is being used in connection with an event in Glasgow, meaning the squad warmed up for their trip to Hungary at Lennoxtown.
Postecoglou will be hoping that the move doesn't spell bad luck for the crucial Ferencvaros clash.
Welsh set to return?
Does the youngster know something we don't?
Ange Postecoglou spoke highly of the Scotland under-21 cap ahead of the trip to Hungary, with first-choice Carl Starfelt out until after the international break.
He hasn't had a game since the defeat to Livingston all the way back on September 19, but is the time right for a recall?
Stephen Welsh looked buzzing at Lennoxtown, so the Australian could have already told him of his second chance at the heart of the Celtic defence in the Europa League.
Ralston shining bright
Is the sun in your eyes, or are you spying Anthony Ralston's rising star?
It's been a breakthrough campaign for the right-back and it has seen him earn a bumper new deal at Celtic.
There have even been calls for Ralston to get in the Scotland squad, and with his form so far this season it's hard to imagine he's not going to break into Steve Clarke's plans at some point.
But for now he will just have to settle for shining at Parkhead.
Johnston for joy
Who can blame Mikey Johnston for cracking a smile?
After months of injury problems, the tricky winger is now at the forefront of Celtic's plans for the future.
He may have been in and out of Ange Postecoglou's staring line-up, but he looks to be continuing to build fitness as he targets top form.
Liel Abada and Jota have been the go to wingers during the Europa League action, but the 22-year-old will be crossing his fingers to get the nod in Budapest.
