Skylar Thompson started the Dolphins’ Week 3 loss, the first contest following Tua Tagovailoa‘s concussion. Thompson had to exit the game due to a rib injury, however, and his status is now in the air. 
“I think we have an important 48 hours to see where [Thompson’s] at,” head coach Mike McDaniel said when speaking to the media on Tuesday (via NFL.com). “We’ll just have to take it a day at a time. There’s a lot on the table.”
Indeed, Thompson’s health situation will be closely monitored in the immediate future. The former seventh-rounder beat out Mike White for the backup gig the offseason; that set him up to take over from Tagovailoa, who is on injured reserve and does not have a return timeline at this point. Thompson completed 13 of 19 passes on Sunday, but he was sacked five times and did not lead any touchdown drives during the 24-3 loss against the Seahawks. He will likely remain atop the depth chart if healthy, but it remains to be seen if that will be the case for Week 4.
If Thompson is unable to play, Tim Boyle (who was a gameday elevation from the practice squad for Week 3 and took over from Thompson on Sunday) would be an option to get the start. The other route available to Miami would be giving Tyler Huntley the nod. Huntley was signed off the Ravens’ practice squad in the wake of the Tagovailoa injury, a move he hoped would come to pass. The 26-year-old has not had a long period to acclimate to the Dolphins’ offense, but McDaniel added (via Jason Owens of Yahoo Sports) starting Huntley is a possibility at this point.
The 1-2 Dolphins will play the 0-3 Titans in Week 4, a game both teams will need to win to rebound from poor starts to the campaign. In Tennessee’s case, the quarterback position is not a question mark with Will Levis recently receiving a vote of confidence. For Miami, though, the situation under center is yet to be determined.