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The projected Top 10 pick in next month's NFL Draft ran the 40-yard dash and unofficially clocked in at multiple times, ranging from 4.46-4.53 seconds, according to multiple outlets. 

McMillan's unofficial 40-yard dash time (4.48 seconds) reported by Jordan Schulz would've been tied for the 25th-fastest time at the NFL Scouting Combine, which McMillan didn't participate in. McMillan is also skipping Big 12 Pro Day in Frisco, Texas this week. 

The 6-5, 212-pound McMillan's speed has been among the most notable talking points regarding his draft stock. 

McMillan has drawn NFL comparisons to other big-bodied wide receivers, including Mike Evans, Larry Fitzgerald and Drake London. Evans ran the 40-yard dash in 4.53 seconds at the NFL Scouting Combine; Fitzgerald ran it in 4.63 seconds, while London posted a time of 4.5 seconds.

Even though McMillan opted to not run the 40-yard dash at the NFL Scouting Combine, Arizona head coach Brent Brennan, wide receivers coach Bobby Wade and general manager Gaizka Crowley, among others, attended. Brennan held several conversations with coaches and general managers about McMillan. 

"Because of that, having that access and having me there, it was a great opportunity for them to ask real questions about these players and how they're going to add value to those organizations when they get there," Brennan said. 

Brennan was also asked about other NFL Draft hopefuls, including offensive lineman Jonah Savaiinaea and kicker Tyler Loop, but "T-Mac is something different," Brennan said on Monday.

Brennan said McMillan's best attributes as a player "is he's an incredibly hard worker" and the former Arizona receiver hasn't caused any internal issues with the UA football program. Plus, "in terms of his movement and ability to play football, he's rare," Brennan said.

"He was a player that was never on a list, never late, he never had an academic issue," Brennan said of McMillan. "He was on point all the time. Not a single misstep in any of that. NFL teams like guys who are serious about their business. There's no question T-Mac is extremely serious about his business. ... His movement, his short-range quickness, his catch radius is totally unique — totally unique. I've coached hundreds of them and I've coached a lot of NFL players, too, but he's unique." 

The NFL Draft from Green Bay, Wisconsin begins on Thursday, April 24 at 5 p.m. on ESPN.