Gareth Southgate believes it will be an "interesting" World Cup if penalties akin to the one England conceded against Tunisia continue to be awarded.
England claimed a 2-1 win over Tunisia in their opening Group G encounter in Volgograd on Monday, but looked set to have to settle for a draw after Harry Kane's opener was cancelled out by a contentious spot-kick from Ferjani Sassi.
Sassi converted from 12 yards after Kyle Walker was penalised for catching Fakhreddine Ben Youssef with his arm.
England then saw two penalty appeals waved away despite Kane appearing to be impeded in the box on each occasion.
The Three Lions seemed to be running out of ideas as they struggled to create chances in the second half, having wasted a plethora of opportunities in the first.
However, Kane headed home the winner at the far post in the 91st minute to spare England's blushes, though Southgate still expressed his bemusement at referee Wilmar Roldan's decisions.
"We recovered from a really harsh decision and kept our composure," Southgate told a media conference. "Our set-plays were a threat all night, we worked on them and got just reward for that.
"I think if it's a penalty at one end it has to be a penalty at the other. Once the first one is given, it wasn't going to be overturned [by VAR] because it wasn't going to be a clear and obvious error.
"If penalties are going to be given for that, it's going to be an interesting tournament, I think there were similar offences at the other end of the pitch."
England midfielder Dele Alli appeared to be struggling with an injury in the first half but was not withdrawn until the 80th minute.
Southgate said of the Tottenham star: "We had to keep monitoring Dele. He was having a little bit of an issue before half-time but he felt he could carry on. The runs he was making and the way he was pressing the ball was still causing a problem."
Put to him that this was the perfect opening game for England as they emerged from it with a win but with plenty to work on, Southgate responded: "We are a team that is improving and developing, therefore there will always be things that we can be better at. We're a long way from perfection."
Southgate made his World Cup debut as a player against Tunisia in 1998, England starting that campaign with a 2-0 win.
Asked about the differences between that game and his World Cup bow as a manager against the same opposition, Southgate said: "I was sat in a drug testing room with Teddy Sheringham while everyone else was celebrating [in 1998].
"Tonight I'm at least able to experience a little bit of what the fans are feeling and the feel of the dressing room. But, of course, the difference being that, as a player you enjoy the moment a little bit longer, as a coach you're into looking at the game back on the way home and immediately focusing everybody around you on the next task. The enjoyment lasts a little bit less time."
|Some people talk too much – Icardi hits back at critics|
|Kovac, Robben praise Augsburg after draw|
|Angels star Ohtani to undergo Tommy John surgery|
|Simeone tips Gimenez to be fit for Madrid derby|
|Smith on his NBA Finals miscue: People make mistakes all the time|
|Rams CB Talib to have ankle surgery|
|Cousins ´feeling a lot better´, still unsure when he´ll return|
|I knew we´d be in trouble with Jones on penalties – Mourinho|
|Coyotes forward Galchenyuk expected to miss opener|
|Guardiola won´t compare Foden to Iniesta|
|Lampard shell-shocked as Derby win at Old Trafford|
|Ryder Cup 2018: USA celebrities take the honours|
|Manchester United´s torrid penalty shoot-out run continues against Derby|
|Guardiola: Foden already a great, great player|
|Atletico Madrid 3 Huesca 0: Rojiblancos cruise ahead of Madrid derby|
|EFL Cup: Lampard dumps out Mourinho, Burnley lose at Burton Albion|
|Mourinho denies Pogba row despite stripping midfielder of vice-captaincy|
|Fabinho situation not complicated, insists Klopp|
|Manchester United 2 Derby County 2 (Derby win 8-7 on pens): Lampard heaps pressure on Mourinho|
|Afghanistan snatch tie after Shahzad pummels India|
|Inter 2 Fiorentina 1: D´Ambrosio maintains Nerazzurri revival|
|Oxford United 0 Manchester City 3: Foden stars as EFL Cup holders cruise into round four|
|Cousin takes Gabon post after Aubameyang rejection|
|Bayern Munich 1 Augsburg 1: Neuer error costs champions|
|Paris Saint-Germain must be a Champions League force to help Neymar - Baptista|
|Salgado warns of ´war´ in Spanish football|
|Cech deserves Arsenal place, says Seaman|
|Halep and Garcia among seeds to fall in Wuhan|
|F1 Raceweek: Mercedes taking no comfort in points advantage|
|Benitez charged by FA for referee comment relating to Zaha treatment|
|Cibulkova dumps out hampered Halep in Wuhan|
|Mourinho questions his players amid reports Pogba won´t captain United again|
|European Ryder Cup diary: Fleetwood´s hair delights Poulter|
|USA Ryder Cup diary: Tiger´s roaring reception, McEnroe´s bold prediction|
|Loans to be limited under new FIFA proposal|
|Prolific Nadolo signs new Montpellier contract|
|Modric? For us, Messi is the best – Valverde|
|Murray makes winning start in Shenzhen|
|Mickelson would cherish first victory on European soil|
|Hodge hoping pressure proves too much for South Africa|
|Woodward in show of support for under-fire Mourinho|
|Mickelson jokes he wants ´a shot a side´ from Tiger in Thanksgiving showdown|
|Reed: Captain America is a villain in Europe|
|Duminy to captain Proteas as Elgar replaces injured Amla|
|No Tottenham timeline for Lloris, Vorm returns|
|Woods ready for ´awesome environment´ on Ryder Cup opening hole|
|Tony Bellew determined to prove doubters wrong against Oleksandr Usyk|
|Tuchel explains why he likes Neymar at number 10|
|Manchester United smash revenue record but profits down|
|Furyk downplays Ryder Cup pairings talk, says Tuesday is about individuals|
|Rejuvenated Tiger out to improve poor Ryder Cup record|
|Saunders fined £100,000 for ´sickening´ online video|
|Hazard can reach his full potential with Sarri´s Chelsea - Zola|
|Ryder Cup heading back in Europe´s direction, says Niall Horan|
|Wow! Klopp hails Sarri´s Chelsea transformation|
|Giovinazzi to partner Raikkonen at Sauber in 2019|
|Bjorn backs ´phenomenal´ Rahm to continue trend of Spanish success|
|Durant in no rush to decide Warriors future|
|Rossi to face anti-doping hearing|
|Mignolet to return for Liverpool against Chelsea|
|Premier League ´interesting´ for Germany boss Low|
|Wilder wins Twitter vote to be Joshua´s next opponent|
|BREAKING NEWS: Isco an El Derbi doubt due to appendicitis|
|Juventus won´t rest Ronaldo ahead of Napoli clash|
|Slater cleared to play in NRL Grand Final|
|Top seed Begu sent packing in Tashkent|
|This isn´t my last hurrah in Ryder Cup, insists Poulter|
|Barba back in NRL with North Queensland Cowboys|
|Arsenal wait on Mkhitaryan and Sokratis|
|All Blacks wary of Pumas pack ahead of Buenos Aires Test|