Titans quarterback Marcus Mariota has a strained hamstring and is listed as day to day, coach Mike Mularkey said Monday.

Mularkey said it could be as late as Sunday before a decision is made on whether Mariota is able to play against the Dolphins in Miami (noon, CBS).

Mariota was injured in Sunday's 57-14 loss against Houston at NRG Stadium.

"I'll be able to give you more information (on Mariota's status) on Wednesday," Mularkey said.

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He said Mariota will not practice until he improves, and that the amount he practices won't dictate his playing status. He also pointed out that Mariota is a "quick healer."

The Titans were off Monday.

Matt Cassel replaced Mariota on Sunday and, Mularkey said, will get "a number of reps" especially in Wednesday's practice.

He also said the team is considering adding another quarterback to the roster.

"Until we see more about Marcus the thought process would be to have Matt take as many reps as possible," Mularkey said.

Mariota was hurt while running for his second touchdown in the first half.

He returned to the field and warmed up for the second half but, after talking with Mularkey, remained on the sideline while Cassel played the rest of the way.

Mularkey said a hamstring injury is difficult to evaluate.

He pointed to running back DeMarco Murray injuring his hamstring against Jacksonville and then being able to play the following week against Seattle in a game in which he had a 75-yard touchdown run.

"With a hamstring injury, each guy's different," Mularkey said. "DeMarco Murray had a little bit of a strain in his and we kind of watched him throughout the week of practice and then he came back and played well. So again, we're just going to take this day by day with Marcus and make sure we're smart with him."

Mularkey said much of the decision will be based on how Mariota says he feels.

"These guys have to be upfront and honest with you, and they understand all of that," he said. "They're not going to subject themselves to further injury when they know there's so much football left to play."

Mariota completed six of 10 passes for 96 yards with two interceptions against Houston. He rushed for 39 yards on four carries. His two TDs came on runs of 34 and 2 yards.

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Mariota has completed 66 of 110 passes for 792 yards on the season. He has thrown three TDs and three interceptions.

Mariota has struggled with injuries since he's been in the NFL. He suffered a knee injury as a rookie in 2015, which forced him to miss four games, and then broke his right leg in a game last December against Jacksonville.

Reach Mike Organ at 615-259-8021 and on Twitter @MikeOrganWriter.