Vichai Srivaddhanaprabha’s son and widow were seen laying a wreath among a sea of tributes from fans outside the stadium, including flowers, football scarves and Buddhist statues.
Vichai’s son Aiyawatt Srivaddhanaprabha, known as “Top”, is chief executive of his father’s duty-free empire King Power and also vice-chairman of the football club Vichai bought in 2010.
Air accident investigators also on Monday said they had recovered the helicopter’s digital flight data recorder, which was subject to “intense heat” in a fire after the crash.
“Today our inspectors.. will start working on the recorder,” the Air Accidents Investigation Branch said in a statement.
Along with other family members and executives from King Power, the two were also seen laying wreaths at the crash site in a car park near the stadium, which is still cordoned off as air accident investigators pick through the wreckage.
Five people died in Saturday’s crash, including also two members of Vichai’s staff, Nursara Suknamai and Kaveporn Punpare, pilot Eric Swaffer and the pilot’s girlfriend, Izabela Roza Lechowicz, also a pilot.
Nursara Suknamai was an actress and a runner-up in Miss Thailand Universe in 2005.
Vichai, 60, a regular at matches who used to fly to and from home games, was much-loved in the city as the driving force behind the club’s historic 2016 Premiership victory.
His blue helicopter took off from the pitch after the stadium emptied following Saturday’s 1-1 draw with West Ham, but crashed moments later in the car park.
Earlier British Prime Minister Theresa May and Prince William, who is president of the Football Association, offered their condolences over the crash.
“I was lucky to have known Vichai for several years. He was a businessman of strong values who was dedicated to his family and who supported a number of important charitable causes,” said William, the Duke of Cambridge.
“He made such a big contribution to football, not least through Leicester City’s magical 2016 season that captured the imagination of the world.
“He will be missed by all fans of the sport and everyone lucky enough to have known him.”
May said her thoughts were with the family and friends of the victims as well as supporters of the club.
“The outpouring of grief is a testament to how many people’s lives were touched by those on board,” she said in a statement.