[4] The Hoops then travelled to the Czech Republic to face Slavia Prague,[5] which was followed by a trip to Ireland to play Shamrock Rovers.

Rapid took the lead on the stroke of half time, but this was later cancelled out by a Moussa Dembélé penalty, which earned Celtic a 1–1 draw.

Brendan Rodgers praised the large travelling support of 9,000 and commented that the result would boost confidence in the squad ahead of the next European qualifier.

[22] Captained by Kieran Tierney for the first time, in the absence of the suspended Scott Brown, Celtic won 5–0 to secure a berth in the quarter-finals.

[24] The Bhoys continued their defence of the trophy, running out 4–0 winners with a double from James Forrest and goals from Scott Sinclair and Callum McGregor securing a return to Hampden Park for the semi-finals.

[28] Goals from James Forrest, Scott Sinclair, Olivier Ntcham, Dedryck Boyata and Odsonne Édouard secured a 5–0 victory for the cup holders.

[30] A James Forrest hat-trick sealed a 3–2 win and Celtic's place in the quarter-finals for the fourth consecutive season.

[34] The Bhoys sealed their place in the final with Tom Rogic, Callum McGregor, Moussa Dembélé and Olivier Ntcham all on the scoresheet.

On 19 June, Celtic were drawn to face Linfield (Northern Ireland) or La Fiorita (San Marino) in the Second Qualifying Round of the UEFA Champions League.

[38] However, on the day of the match, the Northern Irish champions announced that away fans who had purchased tickets for the home end would be given their own section in the stadium.

[40] Griffiths was later suspended by UEFA for one match, for tying a scarf to the goalpost after the game, which was deemed to have provoked a section of the home crowd.

[41] The club was again charged by UEFA for several offences, including illicit banners being displayed by the Green Brigade section of the home support.

Later that month, Martin O'Neill's team succumbed to a 2–0 defeat in Trondheim, with former Celtic player Harald Brattbakk scoring both goals.

Injuries to Moussa Dembélé and Leigh Griffiths – the latter was also suspended – meant that Tom Rogic was tasked with deputising in a False 9 role.

The return leg saw James Forrest start in the same position and score the deciding goal to seal Celtic's place in the next round.

[45] The sides met one round earlier in the previous season's competition, with the Scottish champions recording a 3–2 victory on aggregate.

Nir Bitton deputised at centre half – injuries ruled Dedryck Boyata and Erik Sviatchenko out of the tie – and was singled out for praise by Brendan Rodgers in the aftermath.

Although the Hoops lost 4–3 on the night, goals from Scott Sinclair, Olivier Ntcham and Leigh Griffiths ensured Celtic's place amongst Europe's elite for the second consecutive season.

Paris Saint-Germain inflicted Celtic's heaviest ever home defeat in European competition on Matchday 1, with goals from the most expensive forward line in history: Neymar, Kylian Mbappé and Edinson Cavani.

Despite a valiant display against Bayern Munich at Celtic Park and scoring the first goal against Paris Saint-Germain in European competition that season, Celtic lost all four remaining games in the group, but did parachute into the 2017–18 UEFA Europa League knockout phase after finishing with a better head-to-head record against Anderlecht.

[51] Callum McGregor's strike gave Celtic a narrow first-leg advantage,[52] however, a 3–0 defeat in Saint Petersburg brought the Bhoys' involvement in European competition to an end for the 2017–18 season.