ENGLEWOOD, Colo. (AP) - Drew Lock's bruised ribs prevented him from practicing Wednesday when the Denver Broncos installed their game plan for Miami with backup Brett Rypien running their patchwork offense.
Joining Lock on the sideline was Denver's leading receiver, tight end Noah Fant, who also has sore ribs.
The pair's status is uncertain for Sunday when the reeling Broncos (3-6) host the surging Dolphins (6-3), who have won three in a row under rookie QB Tua Tagovailoa.
If Fant can't go, the Broncos would be down to one healthy tight end in Nick Vannett with Jake Butt (hamstring), Albert Okwuegbunam (knee), Andrew Beck (hamstring) and Austin Fort (knee) all on injured reserve.
If Lock can't go, Rypien would get his second career start.
Rypien led the Broncos past the Jets 37-28 in Week 4 despite throwing three interceptions.
"I thought he handled the situation good, I didn't think he felt any pressure or the moment was too big for him," Fangio said of Rypien's first career start last month. "I thought he went out there and executed the offense, and I would expect that he would benefit from that if he is to play this week."
Lock was hurt in the first half on a blindside tackle by Raiders pass rusher Arden Key, although he stayed in and finished the game. X-rays the following day revealed no fractured ribs but Fangio said the second-year QB was in considerable pain, putting his availability this week into question.
Fangio said Wednesday that Lock had "made good progress" in the 48 hours since and "we'll see how much he continues to make throughout the week."
The Broncos, who have been hit hard by injuries and COVID-19 this season, are taking Lock's latest injury in stride.
"It's no different on my part," wide receiver Tim Patrick said. "I had good games with both of them. It's just my job as a receiver is to make the quarterback look good. That's how I look at it, so whoever's out there, if the ball comes my way, my job is to make a play on it."
Patrick caught six passes from Rypien for a career-high 113 yards against the Jets, then had 101 yards on four receptions in Denver's next game, at New England, when Lock returned from a strained right shoulder.
Lock has thrown 10 interceptions in four games since his return and seems to have regressed from last year, when he won four of his five starts with former offensive coordinator Rich Scangarello.
Now coordinated by Pat Shurmur, Denver's offense leads the league with 21 turnovers, including an NFL-high 16 interceptions by three different quarterbacks.