Steffen played his youth football with local club FC Erlinsbach. He played three years in the Aarau U-14 and U-16 youth teams. He then transferred to SC Schöftland and spent four years with them.
Solothurn and Thun
Steffen played amateur football in the 1. Liga Classic for Solothurn. After one season he transferred to Thun in July 2012[5] and made his professional debut on 2 September 2012 in the game against Servette FC. He scored 4 goals in 19 games for Thun in the 2012–13 Swiss Super League that season.
Young Boys
At the end of that season Steffen was sold for €500.000 to Young Boys. Here he signed a four-year deal in Bern.
Basel
During the winter break of the 2015–16 Super League, on 12 January, Basel announced that Steffen had signed a four-and-a-half-year contract with them.[6] Steffen played his first team league debut for Basel on 7 February, coming in as a substitute in the 74th minute, in the home game in the St. Jakob-Park against Luzern. He scored his first goal for his new club in the same game, it was the final goal of the match in the 85 minute and Basel won the game 3–0.
[7]
Under trainer Urs Fischer Steffen won the Swiss Super League championship with Basel at the end of their 2015–16 season.[8][9] Again at the end of the 2016–17 Super League season Basel won the league title. For the club this was the eighth title in a row and their 20th championship title in total.[10] They also won the Swiss Cup for the twelfth time that season, which meant they had won the double for the sixth time in the club's history.[11]
During the winter break of their 2017–18 season Steffan left the club and signed for VfL Wolfsburg.[12] During his two years with the club Steffan played a total of 112 games for Basel scoring a total of 23 goals. 61 of these games were in the Swiss Super League, seven in the Swiss Cup, 16 in the UEFA competitions (Champions League and Europa League) and 28 were friendly games. He scored 15 goal in the domestic league, two in the cup, two in the European games and the other four were scored during the test games.[13]
Wolfsburg
On 10 January 2018, Steffen signed a three-and-a-half-year deal with VfL Wolfsburg. The transfer fee was reported as being €1.75 million.[14] He scored the first Wolfsburg goal after the temporary cancellation of the Bundesliga because of the COVID-19 pandemic in Germany, against FC Augsburg with a header from the edge of the box.
Lugano
On 30 August 2022, Steffen signed a three-year contract with Lugano.[15]
International career
Steffen made his first appearance for Switzerland on 9 October 2015, in a Euro 2016 qualifier against San Marino. He was subbed on in the 78th minute of a 7–0 victory.
Steffen was forced to sit out of UEFA Euro 2020, due to injury.[17] Following the tournament, he returned to the national team and was frequently chosen in the starting lineup for 2022 World Cup qualifying matches. On 12 October 2021, Steffen scored his first international goal for Switzerland against Lithuania.[18]
On 9 November 2022, he was announced as part of the final squad for the 2022 FIFA World Cup in Qatar.[19] At the tournament itself he only had a brief appearance in their group game against Brazil, coming on in the last fifteen minutes of the game.
On 16 March 2023, he was included in Switzerland's squad for their initial matches of their upcoming UEFA Euro qualifying campaign.[20] On 25 March 2023, he scored a hat-trick in Switzerland's 5–0 win over Belarus, in Novi Sad, Serbia.[21]
^FC Basel 1893 (12 January 2016). "Renato Steffen wechselt zum FC Basel 1893". Renato Steffen moves to FC Basel 1893 (in German). FC Basel 1893 AG. Retrieved 16 November 2022.{{cite web}}: CS1 maint: numeric names: authors list (link)
^Verein "Basler Fussballarchiv” (7 February 2016). "FC Basel - FC Luzern 3:0 (0:0)". Verein "Basler Fussballarchiv”. Retrieved 16 November 2022.
^"FC Basel holt den 19. Meistertitel". FC Basel wins their 19th championship title (in German). SRF Zürich. 30 April 2016. Retrieved 16 November 2022.
^FC Basel 1893 (10 January 2018). "Renato Steffen wechselt zum VfL Wolfsburg". Renato Steffen is moving to VfL Wolfsburg (in German). FC Basel 1893 AG. Retrieved 16 November 2022.{{cite web}}: CS1 maint: numeric names: authors list (link)
^Verein "Basler Fussballarchiv” (2018). "Renato Steffen - FCB statistic". Verein "Basler Fussballarchiv”. Retrieved 16 November 2022.