What happened: Dan Campbell announced Sunday that only Teddy Bridgewater can define whether the decision amounts to retirement. Campbell said the quarterback worried about letting the team down.

Why it matters: Undrafted rookie Luke Altmyer is now the only quarterback behind Jared Goff. Campbell said Altmyer is improving but still needs extensive reps, putting immediate pressure on Detroit's depth plan.

What to watch: Detroit's veteran search and Altmyer's workload are the next preseason developments to watch.