Tupou, 26, originally signed on with the Chargers as an undrafted free agent out of USC back in 2012. His time with the Chargers was short lived, but he has since played for a number of teams including the Bears, Colts, 49ers, Cardinals and Browns.
He appeared in six games during the 2013 season and totaled three tackles on the season.
Lenz, 24, originally signed on with the Bears as an undrafted free agent out of Iowa State back in 2013. He lasted just a few months with the Bears before he was waived and later caught on with the Seahawks.
The Colts wound up bringing him in towards the end of the 2013 season and later signed him to a future/reserve contract in January. However, he was cut just a few weeks ago.