Jamie Skinner, 13, died this morning after collapsing while playing for Edinburgh club Tynecastle FC.
And only hours later, Hibernian FC confirmed the death of one of its youth players David Paul, 18.
Jamie had recently moved to Tynecastle FC from Edinburgh premiership side Hearts.
Tynecastle FC posted an official statement on their website about what happened, but the exact cause of Jamie's death is as yet unknown.
The statement read: "In an innocuous event during the game Jamie collapsed and despite the valiant attempts of everyone at the game, and the ambulance service, attempts to revive him were sadly in vain.
"Although Jamie was new to our Tynecastle family, he had up until recently been playing for Hearts, he was a prospect that un-doubtly would have had a bright future in the game.
"No words can fully express our grief and dismay at seeing this happen, we can only pass on all our thoughts and prayers to friends and family and hope they will get some strength from the out pouring of love and support from everyone.
"Everyone at Tynecastle is in total shock at what has happened, and we are sure the youth football community will join with us in also thinking of all the players, coaches and supporters at the game who witnessed this sad event, and the club also thanks everyone who tried to assist.
"As a mark of respect all Tynecastle teams will hold a minutes silence before their next game."
Jamie's former side Hearts were quick to pass on their condolences to the teenager's family.
And pictures were posted on Twitter of Jamie playing in a Hearts strip.
A statement from Heart of Midlothian Youth Development Committee said: "It is with deep sadness that we note the tragic news of Jamie's untimely death while playing football for Tynecastle FC U14s this morning.
"Jamie was a talented and athletic young footballer who was a member of Hearts U14 squad for the first half of this season.
"Our thoughts are with Jamie's family and friends at this sad time."
Hundreds of tributes for Jamie flooded into Twitter from those who knew him, and from football clubs and fans across the country.
Police Scotland confirmed a 13-year-old boy who collapsed on a football pitch had been taken to hospital where he died. A post-mortem examination will be carried out.
David Paul's death was confirmed in a statement from Hibernian FC this afternoon.
It read: "It is with great sorrow that Hibernian FC today confirms the sad death of youth player David Paul, 18.
"David, who could play in midfield or in attack, passed away in the early hours of today at his home in Edinburgh. There are no suspicious circumstances surrounding David's untimely death.
"David's father, Gordon, said the family were devastated. He thanked those who have contacted the family to express their condolences and offer support, and asked that his family be allowed privacy to come to terms with their loss."
Chairman Rod Petrie added: "Everyone at the club is deeply affected by this. David was a talented and promising young footballer, and a fine young man. Our thoughts - and the thoughts of the entire Hibernian community - are with his family at this dreadful and difficult time for them.
"Whilst we understand that people will wish to offer their support, we hope that the wishes of the family for privacy will be respected."