The Tennessee Titans plan to exercise their fifth-year option on Marcus Mariota.

The move is a matter of "when" and not "if," Jon Robinson told Nashville radio station The Midday 180.

The deadline to declare the fifth-year option for players drafted in 2015 is May 3.

Mariota, who was picked second overall in the 2015 draft, will earn $20.922 million in 2019. He's set to earn $3.73 million in 2018.