Adam Thielen Auctioning Off Alex Trebek Tribute Cleats For Pancreatic Cancer Charity

Adam Thielen is turning one amazing gesture into two ... the Minnesota Vikings star is now auctioning off his Alex Trebek tribute cleats to raise money for pancreatic cancer research.

The 30-year-old wide receiver rocked the spikes for a game just days after the "Jeopardy!" host died in November -- and the homage was awesome.

One of the cleats featured an image of Trebek with a halo. The other had a painted-on "Jeopardy!" style placard that read, "We Will Miss You, Alex."

Now, Thielen is taking the cool tribute one step further ... announcing Friday he's going to sell the footwear with all of the proceeds slated to help the Pancreatic Cancer Action Network find a cure.

As we previously reported, Trebek died due to the disease ... and urged "Jeopardy!" audience members just days before his passing to be wary of symptoms and get tested.

The auction for Thielen's cleats begins Friday and ends Jan. 18.