Champions League Tuesday Playoff Results: Udinese crash out, Malaga through
Neil Lennon's men already had the benefit of a two-goal advantage from last week's first leg at the Olympic Stadium, although had to be wary after former Rangers player Alejandro Bedoya shot wide, after surging past Emilio Izaguirre.
After a slightly edgy opening in Glasgow, the Hoops broke the deadlock and effectively ended the tie with a well worked, if not fortuitious goal. James Forrest's corner was blocked before Scott Brown's delivery into the area located Giorgos Samaras, who despite appearing offside, set up Gary Hooper for a simple tap-in.
With the Scottish side safely through, Helsingborgs failed to even trouble Fraser Forster in the opposite goal, with Victor Wanyama scoring from a header in the 88th minute to make it 2-0 on the night as Celtic ensured its name will be in the hat for Thursday's draw in Monaco.
The German side knew that it would have to create something very special in the Ukrainian capital, and proved to be a threat from the off, as Juan Arango's deft pass into Patrick Herrman was a little too close for comfort for Maxym Koval.
Martin Stranzl denied Ideye Brown with a fantastic last-ditch tackle, before at the other end, Mike Hanke fired his effort over the bar as Gladbach began the task of clawing back two goals with an energetic start in the Olympic Stadium.
Despite the efforts of the impressive Arango, the hosts were comfortable enough in depriving Lucien Favre's side of any offensive forays, though Andriy Yarmolenko tested Marc-Andre ter Stegen on occasions.
The game-changer arrived with 20 or so minutes left, as Arango's cross bamboozled Yevhen Khacheridi, who headed into his own net to jeopardize his side's chances. Seven minutes later, the visitors doubled their advantage when Arango headed in from Alexander Ring's well-worked corner. With two minutes remaining, Denys Garmash's through ball to Brown saw the Nigerian beat ter Stegen and break the visitors' hearts.
Despite Gladbach's efforts, Yuri Syomin's men saw out the closing minutes to deny the spirited Bundesliga side a return to Europe's premier club competition.
The Romanian side immediately found its rhythm and within 20 minutes, the hosts had gone further ahead.
Diogo Valente's excellent cross from the flank met the head of Pantelis Kapetanos, to put Cluj 1-0 ahead on the night, as the Swiss side struggled to contain the opposition.
Basel, which memorably knocked out Manchester United in last season's Champions League was afforded some hope when goalkeeper Mário Felgueiras tripped Marco Streller in the box, with Alexander Frei firing high over the bar to keep the scores level.
The visitors spurned their best chance of the second period as Cabral's effort was well blocked by Felgueiras, but the hosts stood firm to book their Champions League return.
After last week's 2-1 deficit in Moscow, the Turkish outfit was desperate for a strong opening, but the tie had already begun to get away after just six minutes. Former Celtic star Adrian McGeady assisted Ari with a low cross, with the latter providing the finish to beat Mert Gunok.
The hosts were further disadvantaged when Milos Krasic pulled up with a hamstring problem, before substitute Miroslav Stoch spurned a decent chance, his shot rising over the crossbar.
Mehmet Topuz's header slammed off the woodwork in the second half, though Fener ignited its chances of qualification with Moussa Sow turning in Topuz's goal-bound header in the 69th minute.
Demy de Zeeuw was sent off for Unai Emery's side late on, but the extra man failed to galvanize Aykut Kocaman's side, as Spartak sealed a group stage berth.
The Danes led les Dogues 1-0 from last week's first-leg at Parken, and they were against a side which had failed to win any of their last three games in all competitions.
Marvin Martin and Claudemir dictated much of either sides' attacking play early on in northern France, before Rio Mavuba crashed an effort into the side-netting despite a brilliant phase of play from Rudi Garcia's side.
The visitors were unable to keep up with the hosts, with Lille levelling the tie on aggregate just before halftime.
Salomon Kalou found space near the by-line, holding off the challenge of Kris Stadsgaard, before crossing at the far post for Lucas Digne, who broke the deadlock with his first Champions League strike.
The pressure was on for both sides to search for the tie-winning goal, as Tulio de Melo agonizingly headed wide from a Payet corner. Nevertheless, it was Tulio who headed in the winner from substitute Nolan Roux's cross just before halftime in extra-time.