It was a goal that was typical Arsenal in creation, with Bendtner's clever flick releasing Abou Diaby.
Abou Diaby put Arsenal into an early lead but Sami Hyypia lost Phillipe Senderos to head an equaliser.
The impressive Frenchman drove forward with purpose down the right before cutting infield and darting in between Vassiriki Diaby and Koscielny.
Diaby wasted another glorious chance to seal it in the dying minutes when he strolled through but shot straight at Jaaskelainen.
Diaby was forced off injured shortly after and was replaced by Alex Song, who had been rested with Aaron Ramsey drafted in.
Nasri will join a large French contingent at Arsenal which already include captain William Gallas, Gael Clichy, Abou Diaby and Bacary Sagna.
Vassiriki Diaby dispossessed Darius Vassell with a crunching tackle and fed Eboue, whose whipped cross from the right was clinically despatched by Rosicky.
But despite losing Diaby minutes later to a head injury, Arsenal added even more firepower when Baptista was handed his chance by Arsene Wenger.
However, Wenger said that he expects Denilson and Abou Diaby to be fit for Arsenal's final pre-season match, against Legia Warsaw on 7 August.
Matthew Taylor headed Bolton in front from a cross by Gretar Steinsson, who was later clattered by Diaby and the referee produced a straight red.
The turnaround was complete when Thomas Vermaelen fired home Arsenal's third after Abou Diaby had knocked down a corner into the path of the Belgian defender.
But 20 minutes into the game, Arsenal served warning they were about to step through the gears as an interchange between Abou Diaby and Arshavin almost opened up Wolves.
Arsenal also earned a two-goal buffer against promoted Birmingham inside the first 20 minutes, as Robin van Persie and Abou Diaby scored in the space of three minutes.
Arsenal are already having to deal without the services of skipper Cesc Fabregas, England winger Theo Walcott, Dutch forward Robin van Persie, Danish striker Nicklas Bendtner and midfielder Abou Diaby.
If the Frenchman's first-choice midfield five of Samir Nasri, Cesc Fabregas, Alexandre Song, Abou Diaby, and Andrey Arshavin are all fit, will one of them miss out to accommodate an in-form Wilshere?
Meanwhile the French coach has called up Arsenal's Abou Diaby and Chelsea's Lassana Diarra for the first time for France's Euro 2008 qualifier against Lithuania and a friendly against Austria later this month.
Further evidence of Arsenal's lack of concentration came when Diaby produced a foul throw, but if that was comedy of sorts, there was nothing funny about the Frenchman's challenge on Steinsson which followed.
As Arsenal continued to carve open the Porto defence, Helton twice came to his side's rescue as he saved low down from Bendtner, then dived at his post to push out Abou Diaby's header.
As the rain dumped on to the Emirates pitch, Wenger opted to sacrifice his attacking options and bring on Abou Diaby for the impressive Bendtner, while Zola, desperate for an equaliser, introduced Cole for Franco.
This was encapsulated in one move when Abou Diaby, surprisingly recalled in favour of Florent Malouda amid suggestions of a training ground row with manager Raymond Domenech, played a superb through ball for Sidney Govou.
Arsenal had earlier taken a first-half lead in the match courtesy of an Andriy Arshavin goal, only to see United hit back to take the lead through a Wayne Rooney penalty and an own goal from Abou Diaby.
Arsenal looked like they had a new lease of life from the side that started the 1-1 draw so lethargically at the weekend and it was little surprise when they went in front through Diaby, on his return to the side.
While just one goal remained the difference between the sides, though, the visitors always felt like they had a chance and when substitute Abou Diaby headed Adebayor's cross wide from six yards out, Bolton might have thought they had a chance.
The Gunners, who face Olympiacos in their final Champions League group game in Athens on Wednesday, are already without Robin van Persie (ankle), Nicklas Bendtner (groin), Gael Clichy (back), Theo Walcott (hamstring), Abou Diaby (calf), Kieran Gibbs (ankle) and Johan Djourou (knee).
Wigan, unbeaten in five games at the DW Stadium, looked well in control but the catalyst for Arsenal's improvement finally came when Diaby left the field with a calf injury and Jack Wilshere came into the fray, bringing some much needed determination and urgency to lacklustre Arsenal.
Wenger made four alterations to his starting line-up - Eboue, Kieran Gibbs, Diaby and Eduardo replacing Bacary Sagna, Gael Clichy, Alexandre Song and Nicklas Bendtner - but the change of personnel did little to disrupt a rhythm that had brought Arsenal impressive wins against Everton and Celtic.
BBC: SPORT | Football | Premier League | Arsenal 4-1 Portsmouth
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