Viguera was definitely promoted to Real's first team in June 2009,[2] but featured rarely as the Basques were crowned champions. On 11 January 2011, he joined Gimnàstic de Tarragona on loan until June,[3] suffering a knee injury the following month that ruled him out for the remainder of the campaign.[4]
On 26 August 2011, Viguera returned to Nàstic again in a temporary deal.[5] After being sparingly used by the Catalans he returned to Real Sociedad on 31 January 2012,[6] and was subsequently loaned to Albacete Balompié of the third tier.[7]
Alavés
On 6 July 2012, Viguera joined neighbouring Deportivo Alavés also in division three.[8] He was an ever-present figure in his first year, scoring 21 goals in all competitions to help his team to achieve promotion to the second tier in the play-offs.[9]
Viguera extended his contract with the club on 14 August 2013, until 2015.[10] He netted 25 times during the season, as the side narrowly avoided relegation;[11] highlights included a hat-trick at CE Sabadell FC on 8 February 2014 in a 4–0 victory.[12]
Athletic Bilbao
On 13 June 2014, Viguera signed a three-year deal with Athletic Bilbao[13] for €1 million.[14] He scored his first La Liga goal for his new team on 21 November, the second of a 3–1 home win over RCD Espanyol.[15]
Sporting Gijón
Viguera agreed to a two-year contract at Sporting de Gijón on 30 August 2016.[16] He scored just once in the league during his first season, which ended in relegation, and featured even less in the following.[17][18]
Numancia
On 1 August 2018, free agent Viguera signed a two-year contract with CD Numancia.[19] He played 24 total games (five starts) and scored once, a late penalty that was the only goal of the game at home to Real Zaragoza on 13 October.[20]
Viguera cut ties with the club on 4 September 2019.[21]
Later career
Viguera joined third-tier Real Unión on 22 January 2020.[22] On 31 August the following year, he moved to CF Intercity in the new Segunda División RFEF.[23] He was used mainly off the bench for the eventually promoted team from Sant Joan d'Alacant, including on 9 January 2022 when he scored his only goal to earn a 1–1 home draw against CF La Nucía.[24]