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NASHVILLE, Tenn. –** Titans quarterback Marcus Mariota is "day to day" with a hamstring injury, coach Mike Mularkey said during his press conference on Monday.

There's a chance his availability for Sunday's game against the Miami Dolphins won't be known until game day.

"He did have an MRI, and there is a strain of the hamstring," Mularkey said of Mariota. "We will right now take it day to day. He is a pretty fast healer, and we'll see where he is at and give you more information on Wednesday."

Mularkey said the Titans "are talking about" the possibility of adding another quarterback to the roster.

Mariota showed his speed on two touchdown runs in Sunday's game against the Texans. He turned on the jets on his 34-yard touchdown run, and he sprinted to the pylon – and made it – on a two-yard touchdown later in the game.

Unfortunately, Mariota suffered a hamstring injury on his second score, and as a result he didn't finish the game. It was part of a bad day for the Titans, who lost 57-14 to the Texans.

Mariota returned to the game after the run, and actually came back on the field to start the second half. But after talking to coaches and trainers, he went back to the locker room and didn't return to the sideline until the fourth quarter.

Back-up quarterback Matt Cassel finished the game for the Titans, and Mularkey said he expects Cassel to "get as many reps as possible" on Wednesday as the Titans see how Mariota is feeling.

"(The MRI result) wasn't surprising," Mularkey said. "I say this about all these guys, with a variety of injuries. The hamstring, each guy is different. … I am going to take it day by day with Marcus and make sure we are smart with him. We're not going to put him out there if he has any chance of doing further damage, we would not do that."

Mariota completed 6-of-10 passes for 96 yards in the first half, with a pair of interceptions. He carried the ball four times for 39 yards in the contest. On the season, Mariota has completed 66-of-110 passes for 792 yards, with three touchdowns and three interceptions.

Cassel completed 4-of-10 passes for 21 yards in the second half, with two interceptions.

The Titans also have quarterback Tyler Ferguson on the team's practice squad.