Arsenal secured top spot in Group C and a place in the knockout stages of the Champions League with a nervy draw against Portuguese Champions Porto.
The home side, who also ensured their progress, were the better side and twice hit the post through the impressive Ricardo Quaresma.
SCOUTING REPORT ON THE OPPOSITION
Paulo Assuncao also saw a fine 25-yard strike go narrowly wide.
Who are they? Champions of Portugal and cup winners for good measure, this is the 10th time in 12 seasons Porto have been in the competition and the third time in succession.
Arsenal failed to create a clear chance with Matthieu Flamini's deflected effort being the closest they came.
Recent form: They are top of the league, are 10 games unbeaten having won the last seven and have yet to lose at home this season where they have won every match bar one - a goalless draw against CSKA Moscow. In total they have been on the receiving end just twice this term, at Arsenal and in the subsequent match at Sporting Braga - who take their colours from the Gunners. Maybe Arsene Wenger's men should pack their home kit for this foray away.
Gunners boss Arsene Wenger had promised his side would look to win the game and not settle for the solitary point needed to ensure progress from the Group stages.
European record: They won the title by beating Monaco in 2004 under the self-styled 'Special One', Jose Mourinho. He refused to celebrate and moved on to Chelsea and Porto's fortunes have since dwindled as the squad broke up.
But a cautious line-up and an edgy opening suggested otherwise.
How did they get here? Do you remember that bit about them doing the double in Portugal last season?
Arsenal were happy to surrender possession for long periods, showing a lack of ambition which invited Porto to attack.
Ones to watch: Goalkeeper Vitor Baia is the only survivor from Porto's Champions League success three seasons ago but has to be content with looking on from the sidelines these days as Helton is the chosen custodian. Anderson may be out injured, but Lucho Gonzalez is an imposing midfield figure chipping in with goals and Ricardo Quaresma, Lisandro Lopez and former Tottenham striker Helder Postiga will pose problems in attack.
But while Porto probed away, they struggled to create much in the final third.
Did you know? Helder Postiga has been banging in the goals this term and has a haul of eight from that unbeaten 10-match run. In his season at Tottenham he netted just twice - the same number of penalties he has scored in shoot-outs to break English hearts in the last two major international competitions.
Wingers Quaresma and Lisandro Lopez were the home side's main threat but Porto were often forced to hit speculative long-range efforts.
BIG MATCH STATS
One such strike saw Assuncao almost break the deadlock with a wicked 25-yard strike that bent away from Jens Lehmann and went inches past the post.
Definitions of terms used:-
Wenger was looking a frustrated figure on the touchline as his side struggled to get out of their own half.
Champions League (CL) - only group phase matches and beyond of this competition which began in 1992-93. Champions Cup/Champions League - all matches played since it began in 1955-56 including qualification matches.European matches - all matches played in the major European tournaments (Fairs Cup, Uefa Cup, Cup Winners' Cup, Champions Cup, Champions League). Uefa Super Cups, Intertoto Cups and the old Intercontinental Cup competition are excluded.
Arsenal finally posed a threat 10 minutes before the break when Flamini saw his shot deflected wide after exchanging passes with Cesc Fabregas.
Qualification
Porto took control at the beginning of the second half and could have been out of sight within 15 minutes.
Arsenal are guaranteed a place in the knockout stages if they get at least a draw in Portugal. They can only fail if they lose this match and CSKA Moscow win away to Hamburg. The Gunners will win the group, providing they are not defeated in this game.
Lopez wriggled to the byeline and pulled the ball back to the impressive Quaresma whose first time shot canoned back off the post.
FC Porto will top the group with a victory. They also need at least a draw to be guaranteed a place in the Champions League knockout phase. Like Arsenal, a defeat will also suffice as long as CSKA Moscow do not win in Germany.
Lopez then mis-kicked when free 12 yards out and Quaresma was left wondering what he had to do to score after seeing another fine effort beat Lehmann but come back off the German's right-hand upright.
Head-to-heads
Both sides seemed to settle for the point they needed after that brief flurry of activity and the game petered out in the final 30 minutes.
The only previous match between these clubs was the 2-0 win for Arsenal at the Emirates Stadium earlier in this group.
FC Porto have hosted English clubs on eight occasions and are yet to lose, winning four and drawing four. Arsenal have visited Portugal twice, drawing on each occasion.
European history
FC Porto are playing in their 45th European season. 1973-74 is the last season in which they did not participate in European competition. They are playing their 12th Champions League season, a record jointly held with Manchester United. They lifted the silverware in 2003-04.
Arsenal's best result in the CL is reaching the final last season. This is the Gunners' ninth appearance in the CL main competition and their seventh in consecutive seasons.
Current European form
FC Porto are currently second in Group G with 10 points. They have won their last three Champions League matches, and are unbeaten in four at home since losing a 2-0 advantage last season and losing to Artmedia Bratislava.
Arsenal lead Group G having won three, drawn one and lost one of their five matches.
Player and disciplinary info
Thierry Henry is suspended for this match after receiving three yellow cards in his four matches. Alexandr Hleb will be suspended for the next match if he receives a yellow card.
Luis Gonzalez, Bruno Alves, Helton and Pepe are all yet to miss a minute of Porto's Champions League campaign this season. Jens Lehmann is Arsenal's only Champions League ever-present. All seven of the Londoners' goals this season have been scored by different players.
Other miscellaneous facts
FC Porto's next defeat will be their 50th in the history of the Champions Cup/Champions League, while the next goal Arsenal concede will be the 100th scored against them in Champions Cup/Champions League matches.
Porto lead the Portuguese League with a five point advantage over second placed Sporting CP. Arsenal are third in the Premiership, trailing leaders Manchester United by 16 points.
