The rapper, who was 26 and a Pittsburgh native, was reportedly found dead at his home in San Fernando Valley.
He was a devoted fan of the Steelers and had attended games with ex-girlfriend and pop star Ariana Grande.
Ahead of the Steelers games against Kansas City Chiefs on Sunday, 23-year-old Conner posted an image to social media of the boots.
An image of Miller, real name Malcolm McCormick, is printed on each cleat along with a message saying: "Thank you Mac."
Song names were also listed on the front of the white boots in blue writing.
Miller died after reportedly having had recent problems with substance abuse. The cause of death has not yet been announced.
In a statement made on her social media on Saturday, Grande described Miller as her "dearest friend" and the "kindest, sweetest soul with demons he never deserved."
She wrote: "I have cared for him and tried to support his sobriety and prayed for his balance for years (and always will of course) but shaming/blaming women for a man's inability to keep it together is a very major problem."
No details of Miller's funeral have been made public yet.
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