ENGLEWOOD, Colo. — Head Coach Vic Fangio isn't ready to officially declare Drew Lock the Broncos' starter for 2020, but the rookie quarterback continues to impress his head coach.

"He's done enough to show he definitely could be the guy," Fangio said Monday after the Broncos' 27-17 win over the Lions. "We're looking for that to be the case."

Lock is now the first Broncos rookie quarterback to win three of his first four starts. He completed 75.8 percent of his passes for 192 yards, no turnovers and a 99.6 quarterback rating in the win against Detroit.

"I'm very encouraged by what Drew has done these four games," Fangio said. "Part of it is too because of the negative. We played a tough game in a tough environment a week ago against a great team [in Kansas City] and things didn't go well, but I liked the way he handled it."

Fangio said Lock, who was on injured reserve from Week 1 through Week 12, used his time on IR to his advantage to prepare for his opportunity.

"I think the biggest jump he made, and I think I've said this before, he really used that 10 weeks he was off to his advantage," Fangio said. "I think he learned more about the NFL, learned more about playing quarterback in the NFL and all the things that go with playing quarterback in the NFL, whereas I think in training camp he was a little bit inundated with everything. I think those 10 weeks were really beneficial to him."

As Lock prepares for his final start of the season, Fangio said he wanted to see more of the same from the Missouri product.

"Just more good play, which he's done for the most part," Fangio said. "I think he's capable of more and just being consistent. He's played well, but I think he can continue to even play better."

MUCH ADO ABOUT THE FLU

The flu bug swept around the Broncos' locker room hard enough to knock guard Dalton Risner out of the second half of Sunday's game.

Fangio said he believed Risner was "the culprit" of the virus that impacted about 10 players, although none were impacted to the extent of Risner.

Once the Broncos learned the virus was making its way around the locker room, they brought in a "super-duper cleaning crew."

"They scrubbed down everything in the meeting rooms, the bathrooms, the showers and the locker room," Fangio said. "We tried to do everything we could."

Six players were listed on Friday's injury report with an illness, but other players had lesser symptoms, as well.

After Sunday's win, Lock said he still felt sick.