The former Croatia international defender was on the books of West Ham as a player from January 1996 until the summer of 1997.
Now a manager of the Hammers, Bilic has explained why he did not leave the London outfit in March 1997.
“It wasn’t a lack of ambition or an unwillingness to try but at the same time I felt great loyalty to West Ham,” the 47-year-old wrote in The London Evening Standard.
“That was why I turned down the chance to join Everton before the transfer deadline in March of that year.
"Instead, I agreed a deal but stayed at Upton Park for the rest of the season to help my team fight relegation.”
“In one of Harry’s books, he said I did it because of a loyalty bonus I would get but that was not true, believe me,” added Bilic. “I would have got more money if I had decided to join Everton straight away.”
Bilic is having a wonderful season as West Ham manager, as his side are in the running for a top-four finish in the Premier League.
The football the Hammers are playing under the Croatian is an improvement of what they did under Sam Allardyce last season.
There is a long way to go in the season, but the start that the Hammers have made has set up for an exciting few months ahead.
West Ham will take on Everton at the Boleyn Ground in the Premier League on Saturday afternoon.