Copeland was one of Teddy Bridgewater's targets during his workout, running crisp routes and catching every pass. He also did some other drills in front of the 29 NFL teams.
"He's solid," one NFL scout said.
The 6-foot-1, 185-pound Copeland also has a new look after getting rid of the blonde mohawk that earned him the nickname "Honey Mustard."
"I knew I was going to cut it eventually," Copeland said of the mohawk. "But I wanted to finish it at the (NFL) Combine. I wanted to have that look at the combine and finish it there.
"So, I cut it afterwards. I wrote on Instagram, 'Long Live Honey Mustard.' That will always live in my heart."
As a senior, Copeland had 58 catches for 780 yards and five touchdowns for the Cardinals. He went to the NFL Combine and impressed, especially because of his speed in the 40-yard dash.
"I have been getting a lot of great feedback," Copeland said. "I was actually talking to coach (Shawn) Watson after the combine and he said that his phone had been blowing up about me, which is a good thing. I'm excited.
"With my combine testing, I did amazing which is a blessing. I am happy to be in this place."
Copeland said he met with or has heard from a bunch of teams and is hoping to hear his name on NFL Draft Day.
"Have heard my stock rose and that teams are interested in me," he said. "(At Louisville) I wasn't able to showcase my speed, so I had to show them that at the combine and a few teams had me at a high 4.3, so that was good."
Copeland said he doesn't mind playing the slot or an outside receiver and can also do some damage on special teams.
"I just want to get the chance," he said.