He is NOT on the 40 man roster right now. If we add him, he won't become a minor league FA. (I got that wrong before.)
He's not rule 5 eligible, so that the 25 man roster thing you are talking about does not apply.
He's been in our system since 2010.
From soxprospects.com...
The following players will become minor league free agents in November 2017 unless they are added to the 40-man roster or re-signed.
Jeremy Barfield, Brian Bogusevic, Bryce Brentz, Dan Butler, Ryan Court, Jacob Dahlstrand, Matt Dominguez, Conrad Gregor, Shawn Haviland, Williams Jerez, Kyle Kendrick, Deiner Lopez, Heiker Meneses, Edgar Olmos, Mike Olt, Mitchell Osnowitz, Tim Roberson, Jose Sermo, Aneury Tavarez, Herny Urrutia, Elih Villaneuva, Marcus Walden, Jordan Weems