Unai Emery feels the referee made the difference in Paris Saint-Germain's 0-0 draw with Montpellier by not awarding what he saw as a "clear" penalty.
Edinson Cavani was sent tumbling inside the box by Pedro Mendes – already on a yellow card – with 10 minutes left but official Clement Turpin signalled for play to continue.
Montpellier defender Mendes did not appear to make contact with the ball and Emery was unsure how the foul was missed.
He told a post-match news conference: "The penalty is very clear. The referee made the difference on it. It was clear on the pitch and on the television pictures, too."
The PSG boss commended Montpellier's defensive efforts as they held firm to end his side's 100 per cent start to the Ligue 1 season.
Neymar was absent due to a reported knee injury and Emery believed the team could have pushed harder for a breakthrough in the absence of the Brazil star.
1 - Paris have only registered 1 shot on target v Montpellier (Mbappé), their lowest tally in a L1 game since August 2016 v Monaco. Mute. pic.twitter.com/edjU0YZ6iM— OptaJean (@OptaJean) September 23, 2017
"The merit belongs to our opponents, who defended well, closing the spaces with great efficiency," said the PSG boss.
"We played the game as we wanted, with a significant amount of possession, but we need to push more to score goals. We had opportunities, but that's not enough to win games.
"The main goal is to win and today it is true that one point is not enough. This game leaves us a lot to analyse to continue our progress."
Despite the disappointment, Emery tried to look for positives in the result.
He added: "It's not a good result but I'm glad the team remained calm about looking for spaces to score – I think it's a sign of progress.
"Analysing afterwards is always easier, but it's true on the pitch we had to attack the space more. When we did that, we had better opportunities."
|Alonso is the most complete driver in F1, says Button|
|Alonso to stay with McLaren|
|Nets guard Jeremy Lin out for season with ruptured patella tendon|
|Coles hails retiring Moore as ´one of the greats´|
|Benteke progressing ´ahead of schedule´|
|Ancelotti to Leicester unlikely, says Clement|
|Berdych´s World Tour Finals chances ended by back injury|
|Dyche not aware of any approach amid Leicester speculation|
|I love you, take my watch! – How Arnautovic earned a special gift from Mourinho|
|Hafeez reported for suspect bowling action|
|´Surprised´ Appleton calls for Foxes focus after Shakespeare sacking|
|Harris: Stokes should follow Warner´s example|
|Brighton boss Hughton feels ´unacceptable´ behaviour remains in football|
|Markram replaces rested Amla for final ODI|
|Benzema ´very happy´ at Real Madrid amid Arsenal rumours|
|Azpilicueta admits to low mood in Chelsea camp|
|Lozowski ends exit talk by signing Saracens extension|
|Button reveals where he plans to race in 2018|
|Bacca: I played for the worst AC Milan in history|
|I don´t want the dog meat, I want the dog himself - Saunders targeting Golovkin or Canelo|
|Aluko ´100 per cent´ in England contention, says interim boss|
|Injured Napoli striker Milik hints at loan move|
|Dortmund not expecting Reus exit|
|Neymar plans to emulate Messi by mentoring Mbappe|
|Mourinho still unclear on fitness of Pogba and Fellaini|
|Wests Tigers centre Idris retires at 27|
|Sodhi replaces injured Astle in New Zealand´s ODI squad|
|Heynckes happy with Muller form|
|Kane describes Ronaldo as ´role model´ following shirt swap|
|PSG star Mbappe: Monaco need time|
|I have full support of Everton board, claims Koeman|
|England have the right balance for Ashes - Bairstow|
|Thomas pulls clear in South Korea|
|Timberwolves, 76ers fall in anticipated openers|
|Cubs stay alive, Yankees poised to reach World Series|
|Girardi calls Tanaka ´special´ after game five masterpiece|
|Cubs´ Maddon ejected after umpires reverse controversial call|
|Brown hails ´exceptional´ Simmons after 76ers debut|
|Wilshere: Arsenal´s character can´t be questioned|
|Simmons replaces Rodda as Hunt misses out for Wallabies|
|No-one can compete with Messi – Bartomeu|
|Brennan named Titans coach|
|Man United risk losing identity under Mourinho – Bellamy|
|Hayward delivers message to Celtics fans from hospital bed|
|Valverde hopes Messi scores 200th European goal this season|
|Storm, Cowboys to meet in round three in 2018|
|Dodgers´ Roberts all too familiar with historic 3-0 comebacks|
|Maddon on staving off elimination: Cubs have to start hitting ball|
|Stop worrying about Chelsea – Conte hits back at Mourinho|
|Roma better than Chelsea, says Nainggolan|
|Bemelmans stuns Kyrgios in Antwerp, Sock back on track in Stockholm|
|Basel coach Wicky demands more focus|
|Heynckes calls for patience from Bayern´s reserve stars|
|Emery calls for PSG improvement despite perfect start|
|Pique handball instinctive, says Barcelona boss Valverde|
|Dzeko was born to score – Di Francesco|
|Lemonis rues Olympiacos collapse against 10-man Barca|
|Rodgers: Individual class inhibiting Celtic|
|David Luiz experiment failed, admits Conte|
|Banvit claim first win as Petrol Olimpija run out of gas|
|Allegri not impressed despite crucial win|
|Svilar risks a lot – Mourinho was aware of Benfica youngster´s shortcomings|
|We played better against Atletico – Hazard|
|Job done for Mbappe and PSG after another big win|
|Colts QB Luck suffers setback in recovery from shoulder injury|
|Simeone maintains ´absolute´ belief in Atletico despite Qarabag draw|
|Mladenovic slump continues in Moscow, Kontaveit crashes out in Luxembourg|
|Louisville fires AD Tom Jurich amid pay-for-play scandal|
|CSKA Moscow 0 Basel 2: Xhaka, Oberlin do the damage|
|Juventus 2 Sporting CP 1: Late Mandzukic intervention saves wasteful Bianconeri|