Reporters saw Flowers with his arm in a sling in the locker room Sunday, but Head Coach John Harbaugh said he’s “pretty optimistic” about his availability.

Fellow wide receiver Nelson Agholor also missed practice after suffering a concussion in the Ravens’ Dec. 15 game against the Giants.

Running back Justice Hill did not practicing after leaving Saturday’s game against the Steelers with a concussion and it would be tough for him to play on a short week. Keaton Mitchell could be active for the first time in weeks as a backup, along with Rasheen Ali, to Derrick Henry.

Other players who missed Monday’s practice were right guard Daniel Faalele (knee), cornerback Tre’Davious White (shoulder), and cornerback Jalyn Armour-Davis (hamstring). Harbaugh also expressed optimism about Faalele’s chances to play in Houston.

Center Tyler Linderbaum (back) was limited Monday after missing Sunday’s practice.

With frigid temperatures in Owings Mills, Md., and the Ravens set for a dome game against the Texans, Monday’s practice is being held indoors.