Thomas Tuchel explained his extra-time goalkeeper substitution was based on statistical data, not spontaneity, with Kepa Arrizabalaga making two shoot-out saves to win the Super Cup for Chelsea.
Gerard Moreno's second-half strike cancelled out Hakim Ziyech's opener at Windsor Park and, with penalties looming, Tuchel sent on Kepa for Edouard Mendy in the closing minutes.
The Spain goalkeeper denied both Aissa Mandi and Raul Albiol in the shoot-out, ensuring a 6-5 penalties win for Chelsea after a 1-1 draw to secure their second Super Cup.
Speaking to BT Sport after the game, Tuchel explained his decision to bring on Kepa was pre-discussed and based on data introduced to him by his analysts and goalkeeping coaches.
"It was not spontaneous," Tuchel responded when asked about the extra-time change. "We talked about it with the goalkeepers after the first cup game against Barnsley. We had some statistics. We were well prepared."
"Kepa has the best percentage at saving penalties. We spoke to the players that this could happen when we play in knockout games. It's fantastic how Edouard [Mendy] accepted it.
"There is proof that Kepa is better in this discipline. They're team players. Edouard does not show the pride to not step off the field. He was happy to do it for the team and take this for the team."
It was a strange reversal of roles for the former Athletic Bilbao man – the world's most expensive goalkeeper – who in the 2019 EFL Cup final refused to go off when then-Chelsea boss Maurizio Sarri attempted to bring on Willy Caballero. Chelsea went on to lose on penalties to Manchester City.
However, Kepa's heroics in Belfast banished any potential Super Cup demons for Chelsea, who picked up their first triumph since 1998, having lost to Atletico Madrid in 2012 and suffered shoot-out heartbreak against both Bayern Munich and Liverpool in 2013 and 2019.
Wednesday's win also ensured Tuchel, the third German coach in a row to lift the Super Cup after Jurgen Klopp and Hansi Flick, maintained his perfect record against Spanish opposition, winning four and drawing five of nine games.
It was not all good news after Chelsea's win, however, with Hakim Ziyech's shoulder injury marring another memorable European outing for Tuchel's men.
Ziyech did return to the stands in the second half with his arm in a sling, though Tuchel conceded "if you take a player out during the first half it's serious."
Chelsea will await news on the extent of Ziyech's injury while their attention now turns to hosting Crystal Palace in their Premier League opener on Saturday.
Germany 7-0 Bosnia-Herzegovina: Nagelsmann's side thump visitors to confirm top spot
Germany posted a commanding 7-0 win over Bosnia-Herzegovina in their penultimate fixture in Freiburg to secure top spot in Group A3 of the Nations League.
Florian Wirtz and Tim Kleindienst scored two goals each while Jamal Musiala, Kai Havertz and Leroy Sane were also on the scoresheet as the Germans posted their fourth win and maintained a five-point lead over the Netherlands in second place.
Julian Nagelsmann's side made a blistering start as Musiala headed home with just 78 seconds on the clock.
Borussia Monchengladbach striker Kleindienst then opened his account for Germany as Robert Andrich's effort deflected off him on its way into the goal in the 23rd minute.
Havertz ensured the hosts went into the interval with a three-goal lead, while Wirtz added two more, including a superb free-kick, before the clock struck the hour mark, effectively ending Bosnia's hopes of a comeback.
Sane joined the party in the 66th minute with Germany's sixth before Kleindienst sealed the victory with his second of the night, a close-range finish, 11 minutes later.
The hosts will wrap up their group stage campaign with a trip to Budapest to face Hungary on Tuesday, while Bosnia, sitting bottom with one point, will host group runners-up Netherlands.
Netherlands 4-0 Hungary: Hosts cruise into Nations League quarter-finals
The Netherlands booked their place in the quarter-finals of the Nations League with a comfortable 4-0 victory over Hungary on Saturday.
Two first-half penalties had put the hosts in control before Denzel Dumfries and Teun Koopmeiners secured second place in Group A3 at the Johan Cruijff ArenA.
A medical emergency on the Hungary bench saw the game suspended after eight minutes, but play resumed with a Netherlands penalty after a Tamas Nikitscher handball, and Wout Weghorst confidently converted.
Cody Gakpo then doubled their lead from the spot in first-half stoppage time when Zsolt Nagy tripped Donyell Malen in the box, and Denes Dibusz was sent the wrong way once more.
Weghorst whipped a delightful, long-range curler against the crossbar shortly after the restart, but Dumfries would get their third in the 64th minute with a drilled finish across goal into the far-bottom corner.
Koopmeiners rounded off the scoring late on, meeting Dumfries' inch-perfect cross to power a header past Dibusz and in at the far post, and was denied a second moments later by the post.
Data Debrief: Oranje march on
The Netherlands knew they needed to avoid defeat to make it to the last eight in the Nations League, but Ronald Koeman's side were not going to settle.
They were on the attack from the very start, registering 22 shots as they created 2.92 expected goals.
Dumfries was at the heart of both goals after half-time, and he became the second player in history to score each of his first nine international goals for the Netherlands in the second half, after Pierre van Hooijdonk (also nine).
'We will bounce back', says Taylor after losing WSL top spot
Manchester City manager Gareth Taylor vowed his side will bounce back after they relinquished the lead in the Women's Super League with a 2-0 defeat to Chelsea.
Mayra Ramirez and Guro Reiten both scored in the space of four minutes late in the second half as defending champions Chelsea condemned City to their first league defeat and leapfrogged them to the summit.
Sonia Bompastor's side now have a two-point lead at the top and a game in hand over City, but Taylor was confident his side will continue fighting the Blues for the WSL title.
"We've always done really well on the occasions we have lost, and we don't lose often. It's a tight challenge," Taylor told Sky Sports after the match.
"We are coming to a team that has done well over the years. We will bounce back for certain. The league is never won in November.
"Football is about getting kicked, and it's how you get back up. We are right up there."
The game looked to be heading for a draw for the most part before Ramirez and Reiten struck in the 75th and 79th minutes respectively, as Chelsea ended the game with an xG of 0.85, compared to City's 0.56.
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