Club career
Añorga
Amaiur began playing in one of the most prominent women's soccer teams in the lower categories of her native Basque Country, Añorga KKE. After different stages and an outstanding performance in the cadet category, she made the jump to the B-team. Her progression continued to be good and she managed to debut with the Añorga first team in the regionalised Segunda División in the 2015–16 season.
Athletic Club
In the summer of 2017 she signed for Athletic Club and was assigned to their B-team, also competing in the second tier, where she remained for three years with a consistent scoring return of more than 10 goals in each of the seasons played with the reserves.
In the 2019–20 Segunda División, Sarriegi represented and finished the season as the team's top scorer with 13 goals as they won their regional group. That season she made her debut with the first team in the Primera División on 19 October 2019 against Real Betis.
Real Sociedad
The following season, she joined hometown club Real Sociedad and finished the 2020–21 Primera División season with 13 goals in 26 games.
Sarriegi was named as one of Real Sociedad's captains for the 2021–22 season. In addition to becoming one of the faces of the team thanks to her contract renewal until 2025, she was awarded the number "7" shirt and is considered one of the club's most important players. She responded to the club's confidence in her by registering her best season to date, both individually with 17 goals and 9 assists in the top division, and at a collective level - the club achieved second place in the league standings and qualified for the Champions League for the first time.
Juventus
On 15 September 2026, Amaiur joined Serie A club Juventus on a three-year contract until 30 June 2029.

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