The Colts were so impressed with Senn they let him start the last two games in the preseason. In all Senn recorded an amazing 30 tackles in the preseason. Heading into the regular season Senn was a long shot to make the roster, but somehow, the Colts made room for the undrafted free agent.
Senn played in all three games leading up to week five, but he did not record a tackle. In week five Senn recorded his first career tackle against the Houston Texans. In week six against the Ravens, Senn recorded two tackles in the Colts first blowout effort.
Senn's next tackle came in week ten against New England. He recorded two tackles in week twelve against San Diego. That's when Senn started to click. From then on, Senn recorded a tackle in every game. Including a six tackle game against the Bengals.
Senn will have to make the Colts roster on special teams, where he will compete with players like Jamie Silva for roster spots.