Keira Walsh

In November 2017, Walsh was called up to the senior England squad for the first time, along with Williamson, by interim coach Marley for the 2019 FIFA Women's World Cup qualification campaign. She received her first cap that month in England's first match against Kazakhstan,providing an assist in the fifteenth minute. During the campaign she was one of two senior Lionesses (with winner Beth Mead) to be nominated for the 2018 England Women's International Young Player of the Year award. Walsh, aged 21 and the youngest player in the squad,captained England for the first time during these qualifiers, starting with the armband in England's final match against Kazakhstan in September 2018, in her seventh senior appearance; England won 6–0.

Walsh has represented England in three SheBelieves Cup tournaments. The team came second on Walsh's debut appearance in 2018, losing to United States by an own goal off the keeper. After the match, Walsh and manager Phil Neville had a "really honest" discussion, setting a target for her development over the year and to instill self-confidence. In 2019, England won the competition; Walsh, one of the three players who featured in every match, provided the long-range assist for the final goal and was voted *She Kicks* player of the match. After Walsh helped the team to victory in the 2019 SheBelieves Cup, Neville said that she was probably the best midfielder at the time, praising her development within the squad after he had been tough on her to provoke this. He then encouraged veteran player Karen Carney to help mentor Walsh through the 2019 Women's World Cup, her first major tournament.

In May 2019, Walsh was selected as part of England's 2019 World Cup squad; her name was announced by DJ Monki as part of England's social-media facing squad announcement. In the opening games of the World Cup, Walsh did not play to her usual standards, but she continued to be picked to start, with Neville having faith in her game and her development; England fans, however, were heavily critical of her continued selection after the early weaker showing. Her performance in the semi-final against United States, which England lost, however, was seen as strong; she provided two long passes that produced Ellen White goals (one was disallowed) and sent a narrowly-saved "thunderbolt" strike at goal from 25 yards herself. Walsh felt that the criticism of her performances was deserved, saying she lacked focus, but said this did not stop it from affecting her. She considered quitting football because of it, working with sports psychologists to rebuild her enjoyment of the game.

Still struggling in January 2020, Walsh was encouraged by Neville and England's then-head of performance "to address her lifestyle habits" so that she could develop further and be able to focus on marginal gains. England came third in the 2020 SheBelieves Cup, held in the United States in March 2020, before returning to England and a match hiatus due to COVID-19 pandemic restrictions. By October 2020, Walsh felt that her mentality was starting to thrive again. At the time, the team were preparing for more international fixtures to return. England's qualification campaign for the 2023 Women's World Cup began in 2021; Walsh was one of four players to captain England during their record 20–0 defeat of Latvia that November.

In June 2022, Walsh was named to the England squad for the UEFA Women's Euro 2022in July, which they won. As part of the marketing in the run-up to the tournament, an image of Walsh was projected on the facade of the National Gallery.Though ill to the point of requiring a nebuliser and missing some training before the first match, she started every match and played all but five minutes in the tournament. She showed "classic understated dominance" and was key throughout the tournament, including mounting England's comeback quarter-final win over Spain. In anticipation of the final against Germany it was reported that the outcome of the match could come down to whether Walsh or her contrasting counterpart Lena Oberdorf outperformed the other.England won 2–1, with Walsh providing the lauded pass for England's first goal scored by Ella Toone in the sixty-second minute; *The New York Times* covered the match by saying it "was Walsh's game". She was named player of the match and was subsequently included in the Team of the Tournament.

During the 2022 Euro campaign, Walsh reflected that she was able to perform so consistently because of manager Sarina Wiegman's coaching style allowing Walsh to have a good mindset, that Wiegman "[is] not bothered that we make mistakes. She's not going to shout at us or belittle us for making mistakes. She knows that that's part of the process and, for me, that gives me the confidence to try those passes"; Walsh repeated the sentiment in a press conference after she was voted player of the match in England's first game after the Euro, a 2–0 win over Austria that saw them qualify for the 2023 World Cup. With her appearance in the final qualification group game, another 10–0 win over Luxembourg on 6 September 2022, Walsh won her 50th England cap.As European champions, England contested the 2023 Women's Finalissima in April 2023, defeating Copa América champions Brazilon penalties to win 1(4)–1(2), with Walsh being named player of the match.