The White Sox Quietly Signed A High-Upside Reliever

As we sit just a few weeks away from Spring Training, the White Sox will likely be busy adding a ton of guys as non-roster invitees to Spring Training. However, there are still some very good free agents out there that could fill some of the needs on the major league club, especially now with the Luis Robert Jr. money freed up, so let’s hope that minor league signings aren’t all the White Sox do between now and Spring Training.

Staying on the topic of non-roster invitees, there was a very savvy move that Chris Getz made that went undetected by everyone until just a few days ago. According to Future Sox and the White Sox transaction page, the White Sox signed relief pitcher Tyson Miller to a minor league deal.

On January 15th, the #WhiteSox signed RHP Tyson Miller to a minor league contract

2.15 ERA in 50.1 IP with the #Cubs in 2024

Missed most of 2025 with a left hip impingement, 37.1 IP for Triple-A Iowapic.twitter.com/k1GtSrTJwq

— FutureSox (@FutureSox) January 23, 2026

This is a very high-upside signing for the White Sox, as Miller has been a very productive major league bullpen arm as recently as 2024. The reason it went undetected by most until just a few days ago is because January 15th was the day that the international signing period signings were made official, so there were a ton of moves posted on the transactions page, burying the Miller signing.

In 2024 between the Seattle Mariners and the Chicago Cubs, Miller posted a stellar 2.32 ERA and a phenomenal .8 WHIP. He also struck out 54 batters in 62 innings, while walking just 11 batters. These are all-star level numbers out of the bullpen.

Unfortunately for Miller, he was hurt for most of the 2025 season, throwing just 37 innings for the Cubs AAA team, where he had an elevated 6 ERA. Miller has just 93 major league innings under his belt and has bounced around a few teams, but he could potentially be one of the best White Sox relievers with another extended look.

According to Baseball Reference’s projections for Miller, they predict he will throw 31 innings of 3.7 ERA baseball with a 1.1 WHIP. This would be a huge addition to the bullpen, as that would have been one of the best performances out of the bullpen in the last few years.

Miller has a chance to make the team out of Spring Training, especially if he is fully healthy. I would imagine he has a leg up over most of the other non-roster invitees, with a strong chance to take a spot from someone who is already on the 40-man roster.