Grasu (6-3, 301) previously spent time with the Bears, Ravens and Dolphins since entering the NFL in 2015, the same year as Mariota.

Drafted in the third round by the Bears, Grasu has played in 17 games, with 13 starts. He missed the 2016 season with a torn ACL after spending that offseason working under the tutelage of Hall of Famer Kevin Mawae, a Bears assistant the time. As a rookie for the Bears, Grasu started eight games at center. Following the 2016 season, he started four games at center in 2017.

Grasu was waived by the Bears at the end of the 2018 training camp and signed with the Ravens, where he played in three games. Grasu also spent the month of December with the Miami Dolphins, before being waived.

In Tennessee, he has his work cut out for him while competing behind starting center Ben Jones and others. In addition to Jones, center Corey Levin also returns with experience inside, and the team has other options as well.

Grasu knows he'll have to perform well to give himself a shot in the competition. Grasu has mainly worked at center, but he played some guard in Baltimore as well.

"Nothing is given to you," he said. "I know I have to work hard every day, and I have to prove myself every day to this team, that I can be the type of player they are looking for. Obviously things in Chicago didn't go as planned, but it's how you react to it. I am very fortunate and blessed to be here. It is a privilege to be here.

"And I am willing to do whatever the team asks me to do. I'll hop on one leg for the entire time, be a water boy, whatever. That's the type of guy I am."