The former Ghana striker was hit by stroke after retiring from football and this subsequently led to Aphasia, which affects one’s ability to speak properly.
Agogo, 38 who is now cared for by his mother appeared in the BBC Four documentary on Sunday to create awareness of Aphasia which affects one out of every three stroke victims.
"I had thoughts but where is my voice man?" Junior Agogo sarcastically asks when conducting the interview.
The Guardian adds that: "Junior Agogo, formerly a Premier League footballer, talks well but loses his thread. Sometimes he runs in the park with his dog, but he is usually in his flat with his mother, or he stays in bed. He appears to have lost his self-confidence. He wants to be going somewhere but he cannot".
The forward began his career with the Owls, playing three games for the then Premier League side between 1997 and 2000.
He went on to score over 100 career goals, his most notable spell coming with Bristol Rovers, for whom Agogo scored 45 goals in 140 games between 2003 and 2006.
He also helped Nottingham Forest to promotion from League One in 2007/2008, finishing as the club’s top goalscorer as they finished runners-up in the division.