Thomson ran on to it and swept the ball low under Boruc for a classy finish.
"All credit to Boruc and the whole Celtic defence, they defended well, " added the Hibs boss.
Nine minutes from time, Obua blasted in a long-range effort that skimmed past Boruc's left-hand post.
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His shot had plenty of power but insufficient curl to beat Boruc at his far post.
He fed Eboue, who took his time to find space and fire a low finish beyond Boruc.
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Goalkeeper Artur Boruc was selected in goal for Celtic despite an error in the weekend defeat at Hibernian.
In December, Boruc fumbled Hibernian midfielder John Rankin's "squiggler" shot from over 40 yards into his own net.
The Portuguese midfielder's swerving effort sailed past the outstretched arms of Artur Boruc and into the bottom corner.
It remains unclear whether Zaluska is being viewed as a replacement or a back-up to fellow Pole Artur Boruc.
Polish international goalkeeper Boruc and Scotland defender McManus are close to tying up moves to Fiorentina and Middlesbrough respectively.
First, Carlos Cuellar had a header cleared off the line then Ferguson's snap-shot from 12 yards was saved by Boruc.
Despite being regarded by many as a world-class goalkeeper, Boruc has made a number of high-profile blunders in recent months.
Boruc was quoted in Polish newspapers as saying that John Hartson was lazy and Roy Keane acted like a star.
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It was rewarded within two minutes when the Russian turned inside the area and slotted a composed effort past Boruc.
Eduardo's 25th-minute penalty, a contentious award after he clashed with Celtic keeper Artur Boruc, extended the Gunners' two-goal first leg lead.
Kenny Miller showed pace and poise to meet a Kris Boyd through ball and slot past Artur Boruc in eight minutes.
He had used a hand to block the ball on the goal-line and Taouil knocked home the penalty, despite Boruc getting close.
Immediately after the restart, Obua flashed an effort across the face of Boruc's goal, but the Polish keeper had the angle covered.
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Le Guen was also delighted with the performance of Swedish defender Karl Svensson, who almost scored only to be denied by Boruc.
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Falkirk were almost handed a lifeline when Carl Finnigan intercepted a poor pass-back from Nakamura, but goalkeeper Artur Boruc blocked the striker's effort.
There were two astonishing saves from Artur Boruc and Allan McGregor, which underlined again the remarkable talent that goalkeepers have for ignoring headlines.
Moments later, former Celtic man Charlie Mulgrew fired in a hopeful shot from 25 yards out that drifted wide of Boruc's right-hand post.
In one such spurt, Giggs seized on an error by Paul Hartley, ran at the Celtic rearguard and ought to have tested Boruc.
Black then tested Boruc with a long drive, as the hosts' inability to score a second goal caused anxiety among the home support.
There appeared to be no contact between Eduardo and Celtic goalkeeper Artur Boruc and referee Manuel Gonzalez gave a penalty that Eduardo converted.
Jonny Evans slid in to restore the lead and Northern Ireland went further ahead when Michal Zewlakow's backpass bobbled past keeper Artur Boruc.
Arsenal ended the half in charge, with Boruc turning Eduardo's left-foot shot to safety and Bendtner heading the resulting corner from Denilson inches wide.
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Caldwell cleared a dangerous low cross by Tevez, then a low left-footed shot by Ronaldo found the grateful gloves of Celtic's Polish keeper Boruc.
The diving Boruc appeared to have the shot covered but could only push the ball against the crossbar on its way into the net.
And there were similar doubts about his second, turned in on the rebound after Celtic keeper Artur Boruc could not hold Cristiano Ronaldo's free-kick.
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