After his ACL injury, Nguyen celebrated his comeback at German national championships in Giessen, where he was qualified to take part at the World Championships 2015 in Glasgow. Although the German team was not directly qualified for the Olympic Games 2016, Nguyen participated at the Test Event of Olympic Games in April 2016. The German team won that round and got the right to participate in the Olympics. The last events before the Olympic Games were quite successful for Nguyen – the bronze medal on the parallel bars with 15,566 at the European Championships in Bern and gold at the German national championships at the rings. That was the 7th title of Nguyen at this apparatus. For the first time since 2009, he did not win the gold medal on the parallel bar and stayed second behind his teammate Lukas Dauser. This caused the second ranking in the overall competition as well but saved the nomination to represent Germany in the Olympic Games 2016.