Cassel was Mariota's backup last season and started for Tennessee in the one game Mariota missed.
Mariota may have avoided a major injury, but Mularkey mentioned that the team is looking into adding another quarterback to its roster this week, which doesn't necessarily bode well for Mariota's status Sunday against the Dolphins.
So the Titans worked out quarterbacks on Tuesday, and ended up reaching a deal with Weeden, the 22nd overall pick of the Cleveland Browns in the 2012 NFL Draft.
He last played in an National Football League game in 2015, when he started three games with the Cowboys and one game with the Texans. Mariota, who is considered day-to-day with a hamstring injury, scored both of Tennessee's touchdowns before he was replaced by Matt Cassel. He appeared in 6 games that year, throwing for 1043 yards, 5 touchdowns, and 2 interceptions on 97-for-140 passing.
In order to make room for Weeden to be signed, the Titans released Josh Carraway, a promising young rookie pass rusher who possesses what looks like a bright future.
The Titans have also done some shuffling on the practice squad. If Mariota plays, he could be limited in his designed run plays as that hamstring heals.