He signed for Stevenage in June 2010 on a two-year contract. In his first season at Stevenage, Mousinho helped guide the club to the second of back-to-back promotions, scoring the winner in the 2010–11 League Two play-off final, as well as finishing as the club's joint top goalscorer for the season. Following an injury-disrupted season during the 2011–12 campaign, Mousinho left Stevenage and joined Preston North End. In his final season at Preston, he was loaned to Gillingham and back to Stevenage before being released and joining Burton Albion in June 2014. He played regularly Burton over three seasons, winning the League Two title in his first season and promotion to the Championship a year later. In August 2017, he joined Oxford United.