His friends rushed him to hospital but the 24-year-old, himself a professional footballer in the Ugandan Premier League, was pronounced dead upon
his arrival at Bombo Military Hospital.
"He has been a passionate fan of Chelsea and would do anything for the club," Musanan's friend Gerald Bagoole told Kawowo news agency.
"We trained with him on Sunday morning, had lunch together."
Kawowo reported: "Being a staunch Chelsea die-hard, it is believed shock might have led to his heart failure and complications."
Fred Kajoba, Musanan's coach at Simba FC, confirmed Musanan had made no complaint during Sunday's training session.
The Federation of Uganda Football Associations (Fufa) released a statement on their website moments after the player’s death on Sunday evening.
“Fufa is in shock after receiving news about the sudden death of Simba FC player Musana Fahad in Bombo this evening,” read the statement.
“The body is currently at the Bombo Barracks Hospital. Burial arrangements will be communicated later.”
Last year a Ugandan Arsenal fan lost his house after placing a bet that the north London side would beat Manchester United.
Chelsea had been leading title rivals City thanks to Andre Schurrle's strike until Lampard struck against the side he faithfully served for over ten years.