The Browns receiver was not in attendance for Cleveland's Tuesday session and is subject to fines.
Head coach Kevin Stefanski said Cooper's absence was not excused.
"These situations, I understand that they do come up," Stefanski said. "I'll really leave all of that between Amari, Amari's agent and AB (general manager Andrew Berry) and those type of conversations. Again, as you guys know, we focus on guys that are here. We'll get some good work in and really keep it at that."
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At 30 years old, there aren't many reasons for Cooper to miss time this season, so we assume this will be hashed out sooner rather than later. The Browns offense as a whole has plenty to prove this year, not least of all is their receiving room.