Only this February Boe found Mogensen collapsed in his hotel room during the European Team Championships in Russia following an aneurism, a bleeding in the brain.
He went under immediate treatment, including an operation in Kazan, before returning to Denmark after a couple of weeks in hospital. His wife, former table tennis player Mie Skov, and young son were beside him in the Russian city.
It wasn't long before Mogensen, who will be 33 three weeks before the Olympic Games, proved his well-known fighting spirit from the badminton courts in his effort to return not only to a normal life but also his sporting career at the highest international level.
Updates on social media showed the improvement week by week and the last element of doubt regarding success in the process was eliminated when he and Boe not only entered the Indonesia Open Superseries tournament but also won their first-round match against the world's no. 10 pair Li Junhui and Liu Yuchen from China.
Mogensen said after Indonesia: "It has obviously been a tough few months for me. But I have received strong support from my coaches, my family and many more. I am extremely pleased with my current condition.
"After the surgery the first thing I told my family was I would be back. I will decide when I would retire from badminton - and it wasn't the right time yet.
"Mathias and I were not satisfied with where we were and we would like to win more medals. Now we are ready to give everything we have in our preparation for the Olympics."
That effort in Indonesia convinced Badminton Denmark that Mogensen had returned to international level with the possibility for further improvement leading up to Rio, leaving no doubt that he and Boe should go to the Games with skills and experience to go for another medal.