During the Tennessee Titans Week 4 loss against the Houston Texans, the team's starting quarterback Marcus Mariota picked up a hamstring injury that has placed him in serious doubt for their Week 5 game against the Miami Dolphins.

Mariota only managed to complete six of his 10 attempts for 96 yards and two interceptions on Sunday, but he did rush for two touchdowns as well before he left the field in the second half, leaving Matt Cassel to finish the game.

The 23-year-old underwent an MRI earlier in the week, and it appears the team still isn't certain if he will be able to play against the Dolphins this weekend, so they've decided to sign another quarterback to backup Cassel in case he is unable to go.

However, the quarterback which they have signed has caused a lot of people to criticise the Titans, as they have opted to sign Brandon Weeden as a backup quarterback, over a more experienced quarterback who is still available, Colin Kaepernick.

According to Terry McCormick of Titans Insider, Titans head coach Mike Mularkey says revealed that it was because of his team's system that they signed Weeden as a backup quarterback over Kaepernick, and nothing else despite the protests over the past year against social injustice by the former San Francisco 49ers star.

Many had felt Tennessee would have been a good fit for Kaepernick due to their ability to use Mariota's mobility, but that doesn't appear to be the case.

Weeden commented on Kaepernick's future in the NFL, saying to Jason Wolf of The Tennessean: "He's had a heck of a career. He played in a Super Bowl. Obviously, he's done a lot of really good things. I think us as players, we all kind of firmly believe that he's a good enough player to play in this league."

Throughout his NFL career with the Cleveland Browns, Dallas Cowboys, and Houston Texans, Weeden threw 31 touchdowns and 30 interceptions. It's unlikely he'll ever see the field for the Titans, but if he does and he performs badly, many fans will be wondering if the team should have signed Kaepernick instead.