The midfielder, 25, suffered a suspected fractured skull in the 2am attack in Retford, Notts.
Matlock town FC paid tribute to Jordan after his tragic death.
Sinnott, left, was much loved by friends and fans alike.
Non-league footballer has died in the hospital around 7pm yesterday evening.
In a statement on their website, Alfreton Town said: "We are saddened and heartbroken to report that Jordan passed away just before 7pm yesterday evening.
"His family and friends were with him at his bedside and we send our sincere condolences to them all at this very sad time.
"Jordan was a model footballer and an exceptional talent during his time at the Impact Arena and had a close affinity with both the manager, assistant and the players he took the field with.
"The club would ask for privacy to be respected to all at the Reds and to Jordan’s family and friends during this delicate time.
"Rest easy Sinbad, we will never forget you."
Matlock FC has paid tribute to 'Gladiator' Sinnott.
Matlock Town FC has also confirmed the death, saying: "We are very sorry to report that Jordan Sinnott has passed away just before 7pm this yesterday evening.
"His family and friends were with him at his bedside and we send our sincere condolences to them all at this very sad time."
Tributes from friends and family have been posted online.
Family friend, Gaz Stokes, said on Facebook: "Just cannot get my head around this. Devastated - a talented footballer and top lad. RIP my friend. You will be greatly missed. Thoughts and prayers are with your family. Fly high with the angels Jordan."
Police previously said Jordan was found unconscious in the town's Market Place at 2am, following a pub car park brawl involving eight men and a woman at 11.25pm on Friday.
Nottinghamshire Police said: "Officers were later called to assist ambulance crews who were attempting to treat Mr Sinnott after he was found unconscious with a suspected fractured skull following a subsequent incident at around 2am in the town’s Market Place.
"He remains in hospital where he is continuing to be treated for life-threatening injuries."
Notts Police has confirmed that Mr. Sinnott has not died.
A man, aged 44, suffered a suspected broken jaw in the two linked attacks and a 27-year-old had his nose broken.
A suspect aged 27 was arrested in relation to both incidents.
Sinnott, 25, is currently on loan at Matlock Town from National League North side Alfreton Town.
Both clubs cancelled their matches today at short notice "due to unforeseen and tragic circumstances."
His former club Halifax Town announced Jordan had died, but later withdrew the statement as police said he was still in intensive care.
A family friend wrote on Facebook this afternoon: "Just to let the football family know that, despite news to the contrary, Jordan Sinnott has not passed away.
"He is currently very poorly in hospital and is fighting. Come on Jordan keep fighting. Prayers required please."
Halifax Town has amended their previous tweet.
Jordan, who also played for Chesterfield and Huddersfield, is the son of Lee Sinnott who captained the Terriers and went on to make 500 Football League appearances.
Jordan joined Altrincham in 2015 after leaving Huddersfield the same year, and had a prior loan spell at Bury.
He also played for Halifax and Chesterfield before joining Alfreton in 2018.
As tributes were made online, both Alfreton and Matlock postponed their games due to "tragic and unforeseen circumstances."
Alfreton chairman, Wayne Bradley, said: "Our prayers go out to Jordan, his family and friends ... keep fighting Sinbad."
Ex-club Huddersfield, where Sinnott began his career in 2012, wrote online: "Everyone at Huddersfield Town is devasted to hear of the loss of #htafc Academy graduate Jordan Sinnott.
"Our thoughts are with his friends and family at this tragic time."
Detective Inspector Justine Wilson from Nottinghamshire Police said: “I would ask that the public are mindful of the impact that comments made on social media could have on both the families of those involved and on what remains a live criminal investigation into a very serious assault.
“Our detectives are continuing their enquiries to understand how three men came to sustain their injuries.
"This incident happened at a very busy time and we believe there are still a number of witnesses who have still not come forward.”
Sinnott is a former Huddersfield player and also had a loan spell at Bury.
Sinnott was involved in a brawl at the Dominie Cross earlier on Friday evening.
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