The four-time All-Pro and seven-time Pro Bowl selection posted a photo to social media on Wednesday night, displaying three of his Steelers jerseys with a slight alteration to the nameplates.
Brown took some tape and wrote an "S" on it, placing the strips behind his name on the back of the jerseys to form the name "Browns."
"Who else has their No. 84 Browns jerseys ready for Sunday?" Brown wrote for the caption on the posts.
The post had more than 225,000 likes on Instagram and 33,000 likes on Twitter as of Thursday afternoon.
Brown's post was prompted by the fact that the Steelers need the Browns to beat the Baltimore Ravens on Sunday for a chance to win the AFC North. Pittsburgh (8-6-1) needs to beat or tie the Cincinnati Bengals in addition to the Browns win to claim the division crown.
Steelers cornerback Joe Haden, who previously played for the Browns, said he has talked to some of his former teammates about beating the Ravens.
"I've talked to a couple of them, giving them some motivation," Haden said, according to Steelers.com.
Browns offensive lineman Joel Bitonio thinks it's a "cool story" that the Steelers need the Browns to win.
"It's the NFL, man," Bitonio told ClevelandBrowns.com.
"It's crazy. If it was any other week, people would be like, what are you talking about? But that's how the NFL works. They need us to win and it's a cool story for the fans to get excited about."