Steven Gerrard has donated £96,000 to the Hillsborough Family Support Group ahead of Tuesday's Merseyside derby.
The group, along with the Hillsborough Justice Campaign, has been leading the fight to discover what happened at the 1989 FA Cup semi-final which led to 96 Liverpool fans losing their lives.
The Liverpool captain's cousin Jon-Paul Gilhooley, 10, died at Hillsborough.
Gerrard said it was something he had "wanted to do for a while" but "wanted to get the timing right".
"It's to send a message of togetherness out as well," he added.
"I know there's a bit of banter in the stands when the game's going on but, for me, the Everton fans have been superb since Hillsborough".
'A special city'
He added: "I think it's good timing to send this out now, just before the Merseyside derby, but also there's a huge thank you from not just myself but from all the Liverpudlians and all the help and support the Everton fans have given us with this.
"When there is a tragedy in this city, you do get touching moments. It does unite and it does make you feel like you are part of such a special city".
Ninety-six Liverpool fans died as a result of a crush at Sheffield Wednesday's Hillsborough ground during Liverpool's game against Nottingham Forest.
Gerrard was a few weeks short of his ninth birthday when the tragedy, the worst sporting disaster in the country's history, occurred.
Fresh inquests into the deaths will begin in Warrington in March after the original accidental death verdicts were quashed in 2012 following an independent report.
The Hillsborough Family Support Group was founded in May 1989 and represents 74 of the families affected by the tragedy.
Liverpool face Everton at Anfield at 20:00 BST on Tuesday.