Mattheus will not be tendered a contract by the Reds, C. Trent Rosecrans of the Cincinnati Enquirer reports.
The Reds took a flier on Mattheus after the Angels designated him for assignment in mid-May, but he did not impress the team enough to earn a contract tender heading into his first winter of arbitration eligibility. Another team will likely bring in the right-hander on the cheap, because while he rarely misses bats, Mattheus is able to keep the ball on the ground and he showed improved control in 2015.