Sharks Matsushima returned to South Africa in 2012, enrolling at the Sharks Academy in
Durban, becoming the first Japanese player to do so. He played Under-20 club rugby for Harlequins and started twelve matches for the side in the
2012 Under-19 Provincial Championship, scoring three tries as his side reached the semi-final of the competition, where they lost 46–35 to the side despite a Matsushima try early in the second half. At the end of 2012, Matsushima was also invited to attend a training camp for the
South African Under-20 team in preparation for the
2013 IRB Junior World Championship. Matsushima made his first class debut for a side during the
2013 Vodacom Cup competition, starting their final round-robin match against
Argentine side . He took just three minutes to add his name to the scoresheet by scoring an early try to set the Sharks on their way to a 46–31 victory in the match in Durban. He also played in their quarter-final match against eventual champions , but could not prevent his side suffering a 25–42 loss to be eliminated from the competition. In the latter half of 2013, he featured prominently for the side in the
2013 Under-21 Provincial Championship, scoring three tries in eleven starts as his side reached the semi-finals of the competition, where they were eliminated by the s.
Tokyo Sungoliath Matsushima joined Japanese
Top League side
Suntory Sungoliath prior to the
2014–15 Top League season. He made his debut for the side in the opening round of the tournament in a 17–13 victory over
Coca-Cola Red Sparks. Two more appearances followed in the
pool stage of the competition – against
Kintetsu Liners and
NTT DoCoMo Red Hurricanes – to help his side finish in second position in Pool B to qualify for Group 1, the title play-offs. He started all seven of their matches in Group 1 in the outside centre position and scored four tries – two of those in their final group match against
Toyota Verblitz in a 40–19 victory – as they finished fifth in the group to qualify for the
wildcard play-offs. His performances also earned him an inclusion in the Top League Team of the Season.
Super Rugby Matsushima joined Australian
Super Rugby side the prior to the
2015 Super Rugby season. Matsushima joined Australian
Super Rugby side the on a short-term deal for the
2016 Super Rugby season.
Clermont Matsushima joined French
Top 14 side
ASM Clermont Auvergne following the 2020 Top League season. He made his debut in a 36–27 defeat to
Racing 92 in the
2019-20 European Rugby Champions Cup, scoring a try. However, his
Top 14 debut against
Toulouse ended after 16 minutes because of an injury. His first start since returning from injury saw him score his first two tries in domestic competition, in a 50–29 win over
Pau. He made important contributions to Clermont's
2020-21 European Rugby Champions Cup campaign, scoring a hat-trick in a 51–38 away win at
Bristol Bears in the pool stage and a decisive late try in the Round of 16 against
Wasps. His second season in France was cut short by injury, damaging his shoulder in defeat to
Leicester Tigers in April 2022, which would prove to be his final performance for
Les Jaunards. His contribution to the team was praised by coach
Franck Azéma, who described how Matsushima "has speed, punch, he brings a certain execution in the gesture. He has speed that everyone sees but he has a great knowledge of the fundamentals of the position of full-back or winger. He's comfortable with the ball and that is what you expect from an
ASM player." Matsushima spoke highly of how his experience developed his game, saying "I gained a lot of match experience and have become more mentally composed. I've gotten better at making quick decisions." == International career ==