Tottenham say they are "devastated" that fitness coach Gian Piero Ventrone has died aged 61.
"As loveable off the pitch as he was demanding on it, Gian Piero quickly became a hugely popular figure with players and staff," the club said.
Ventrone was part of Italy manager Marcello Lippi's staff when the country won the 2006 World Cup.
He has also held roles at Juventus, Catania, JS Suning, GZ Evergrande and AC Ajaccio.
"He will be greatly missed by everyone at the club and our thoughts are with his family and friends at this impossibly sad time," added a Tottenham statement.