Coates was a third-round pick in 2015. He made just 22 catches for 446 yards and two touchdowns across 21 appearances for the Steelers.
The 24-year-old Auburn product told Gerry Dulac of the Pittsburgh Post-Gazette last month the 2017 season would be a chance to show he's better than those lackluster numbers suggested.
"You always got to prove yourself; I don't care how good a season you had or how bad a season you had," Coates said. "You always got to prove to them and show them you're capable of doing the same things you did before. You always want to show them you worked on this or I got better at that. There's always something to prove, no matter who you are."
There's No Offseason for NFL Workout Warriors
Norman Goes on Shopping Spree for Detained Families
Hue Jackson 'Cleansed' Cleveland with Lake Erie Plunge
'Last Chance U 'Star Getting His NFL Shot
Is 44-Year-Old T.O. Working Out for a Comeback?
Eagles Drafted a 6'8", 346-Lb Rugby Player 😳
Happy 4-Year Anniversary to the 2014 NFL WR Class
One-Handed LB Might Be Draft's Biggest Badass
Mayfield's Journey to the Draft Ends Thursday
Ball Fam Has Nothing on the St. Browns 😏
NFL Stars Spending Their Offseasons Giving Back
Derrius Guice Runs from Difficult Upbringing
Harold Landry Is Draft's Best Pure Pass-Rusher
Which Teams Are the Best Fit for Dez?
Johnny Football Is BACK!
Quavo's Mega-Celebrity Flag Football Game
Meet the NFL's Next Alshon Jeffery
Tremaine Edmunds Is NFL Draft No-Brainer
Grading the Rams' Deal with Suh
Meet the Undisputed Top CB in the NFL Draft
Coates underwent sports hernia surgery in February and a knee scope in July, which caused him to miss stretches of the Steelers' offseason and preseason work. He made four catches for 21 yards during the team's exhibition schedule.
Coates should compete with Ricardo Louis and Rashard Higgins for playing time behind Corey Coleman and Kenny Britt, the Browns' projected starters at wide receiver.