The 44-year-old, who was working as Tottenham's under-23s coach.
statement on the club website reads:
"Ugo received immediate treatment after suffering a cardiac arrest at the Training Centre yesterday before being transferred to hospital, where he passed away in the early hours of this morning.
Head of Coaching and Player Development John McDermott said: “Words cannot express the shock and sadness that we all feel at the Club. Ugo’s immense presence will be irreplaceable. Our heartfelt sympathies go out to his wife Gemma and his family.”
The Club sends its deepest condolences to Ugo’s family.
Gemma has specifically asked that the family are given privacy at this difficult time.
We should also like to place on record our thanks to all the medical professionals including those at North Middlesex University Hospital, Royal Brompton Hospital and Harefield Hospital for their care and support."
Ehiogu, who spent most of his career at Aston Villa where he won the League Cup in 1996, gained four England caps.
As well as playing more than 300 times for Villa, London-born Ehiogu played more than 100 times for Middlesbrough after signing for them in 2000.
He joined Tottenham's coaching staff in 2014.
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