Mikel Arteta's decision to include Ethan Nwaneri was a "pure gut feeling" after the 15-year-old made Premier League history at Brentford.
Arsenal were cruising towards a 3-0 victory over Thomas Frank's side on Sunday after goals from William Saliba, Gabriel Jesus and Fabio Vieira before Arteta sent on Nwaneri in stoppage time.
Aged just 15 years and 181 days, Nwaneri became the youngest player in Premier League history, breaking Harvey Elliott's record of 16 years and 30 days for Fulham.
Fellow youngster Lino Sousa was an unused substitute and Arteta suggested the injury to Martin Odegaard, alongside impressive performances for Arsenal's youth side, offered Nwaneri the chance.
"It was a pure gut feeling. I met the boy and really liked what I saw," the Gunners manager said.
"Per Mertesacker and the academy staff are giving me really good information, Edu as well. I met Ethan, he's trained a couple of times with us.
"[Saturday] he had to come because we have injuries, especially the injury of Martin and then I had that feeling that if the opportunity could come that I was going to do it."
While Arsenal were in complete control as Nwaneri was introduced with four minutes of added time indicated, Arteta said he sent on the youngster with little instruction.
"Those things it is better not to tell them," the Spaniard responded when asked if he had sent Nwaneri on with a message. "Just throw him [on] there and see what happens."
Arsenal leapfrogged Manchester City at the Premier League summit with victory and will have the international break to prepare for tough tests in their next two league clashes with Tottenham and Liverpool.
Frank praises Brentford's pressing, sees no tactical revamp with Toney departure
Thomas Frank heaped praise on Brentford's pressing following their 3-1 victory over Southampton on Saturday.
Bryan Mbeumo scored twice from Brentford's forwards forcing the Southampton backline into errors as the Bees earned their second Premier League win of the season.
This did not go unnoticed by Frank, who believes his side rank as one of the best in the league when it comes to that specific aspect.
He told BBC Sport: "They made errors because we pressed them unbelievably well. I think we are one of the best teams to do the high pressure in the Premier League.
"The players are so committed and that is the reason why we capitalised on errors from Southampton.”
Despite the departure of Ivan Toney to Al-Ahli, Frank does not think their style of play will have to be restructured too much, with both Mbuemo and Yoane Wissa enjoying productive starts to the season in his absence.
Frank said: “Ivan is a fantastic player, I'd love to have him in the team but he has his own journey and is going elsewhere.
"Our style of play hasn't changed. Wissa and Ivan are different players but the style doesn't change.”
Southampton boss Russell Martin was frustrated with his side’s mistakes at crucial moments, believing their performance was far better than the scoreline suggested.
He said to the BBC: “We made two mistakes that we were punished for, which is frustrating and disappointing.
"I saw lots of good things to feel positive about. I feel a lot better this week than I did after the Nottingham Forest game.”
Bayer Leverkusen 2-3 Leipzig: Visitors fightback halts unbeaten streak for Alonso's side
Bayer Leverkusen suffered their first defeat in 36 Bundesliga matches, as Leipzig came from behind to stun Xabi Alonso's side 3-2 at BayArena.
Lois Openda struck twice for Marco Rose's, who recovered from 2-0 down to make it two wins from two and move to the summit of the table.
It looked like business as usual for the reigning Bundesliga champions when they scored twice in the last seven minutes of the first half through Jeremie Frimpong and Alejandro Grimaldo.
However, Leipzig replied deep into first-half stoppage time with Kevin Kampl reducing the deficit.
Openda then brought the visitors level in the 57th minute, before a stunning long-range strike completed the turnaround 10 minutes from time, condemning Leverkusen to their first league defeat in 15 months.
Data Debrief: Leverkusen's long streak comes to a shuddering halt
Leipzig became the first side to beat Leverkusen in a Bundesliga match since Bochum achieved the feat a staggering 462 days earlier.
The visitors have begun a Bundesliga season with two wins from two for only the second time, also doing so in 2019-20.
They are also now unbeaten in 13 league matches, their longest such streak since Rose took charge.
As for Leverkusen, their invincible streak is officially history, as is their 29-game unbeaten run on home soil.
'We really let ourselves down' - Coleman slams Everton after late Bournemouth collapse
Seamus Coleman acknowledged Everton "really let ourselves down" and must "look at ourselves in the mirror" following their spectacular late collapse against Bournemouth.
Sean Dyche's side, who were seeking their first points of the season, led 2-0 in the 87th minute at Goodison Park through goals from Michael Keane and Dominic Calvert-Lewin.
However, the hosts were undone by three crosses in the latter stages, with Antoine Semenyo pulling a goal back and Lewis Cook levelling, before Luis Sinisterra completed a sensational turnaround in the sixth minute of stoppage time.
Boos rung around Goodison Park as the Toffees remained pointless and rooted to the foot of the Premier League table, and Coleman echoed the supporters' frustrations.
"We really let ourselves down in front of our fans," the skipper said. "We cannot take our foot off the gas at this level. Unfortunately, we did that.
"We cannot be conceding the goals that we did. We have to look at ourselves in the mirror."
Meanwhile, Dyche bemoaned the lack of responsibility amongst his players, as they became the first side in Premier League history to lose a game after leading by two or more goals in the 87th minute.
"We did so much right until they scored their first goal," the Everton head coach said. "The game should have been out of sight. We conceded one and then threw it away. I can't put my finger on it right now.
"They kept raining it forward and got their reward in the end. They were playing it forward and crossing it into the box, and we didn't deal with it. Simple stuff, but we threw it away. It is the third game we have thrown away this season.
"Everyone was looking at someone else to deal with things and that is when there is trouble. You could see the body language change. You have to see games through, and we have enough experience to do that, but today we didn't."
Bournemouth boss Andoni Iraola added: "It was the worst game we played this season. Everton deserved to win today, but the players kept pushing.
"I always have hope because this team has spirit. We have done it before and had some good comebacks. The spark of the first goal made us believe we could do it again."
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