Fedde embraces role change from starter to reliever after Luis Castillo trade shifts White Sox plans

ST. PETERSBURG, Fla. It is a familiar baseball storyline, a team reshaping its pitching staff as the season moves deeper, but this one comes with a clear role switch. After Luis Castillo was acquired for the White Sox rotation via a trade with the Mariners, Erick Fedde has moved into the bullpen, changing not only where he pitches, but how he is expected to help from day to day.

Fedde, 33, rejoined Chicago on a one-year deal for the 2026 season worth $1.5 million. The move back to the White Sox had positioned him as a rotation option, and the adjustment to reliever duties underscores how quickly a pitching plan can evolve when a new high-end starter arrives.

The shift also speaks to how teams manage veteran depth. Starters can be pulled into late-inning leverage situations when matchups or performance require it, but it is not always seamless. In this case, Fedde’s stance is straightforward. According to the White Sox organization’s game notes, he spoke with a tone of acceptance about the change, saying, “Let’s do it,” reflecting an effort to be useful immediately in the bullpen rather than waiting for another chance to start.

Castillo’s addition, the team emphasized in its release, is what triggered the personnel reshuffle. With Castillo now in the rotation, the White Sox had to redistribute innings and availability, and Fedde became part of that rebalancing. For Chicago, that means one of its more experienced pitchers is now being tasked with a different kind of responsibility: short runs of high leverage rather than multi-inning starts.

From a team-building perspective, bullpen flexibility matters because it allows managers to cover for the inevitable swings of a long season. Moving Fedde to the relief corps can give the White Sox a more reliable option for spots where they need a steady arm for a few key outs, especially when starters are limited by pitch counts, matchup considerations, or game state.

The next thing to watch is how quickly Fedde adapts to the cadence of relief. Starters transitioning to the bullpen often face timing adjustments, including how they warm up and how they approach batters without the rhythm of an opening to establish a plan over multiple trips. Another practical question is whether Chicago uses him in a specific bridge role or expands his responsibilities across different leverage tiers as the staff settles.

For the White Sox, the payroll-and-role math is also a reminder that 2026 pitching depth is likely to be fluid. Fedde’s contract ensures he remains part of the plan, but his path within the staff can shift, depending on how Castillo fits and how other arms respond over the coming weeks.

For the Mariners, the trade that sent Castillo to Chicago reverberates beyond the rotation spot he fills. Moves like this often bring both immediacy and uncertainty, and the effect can show up in how both teams handle their remaining pitching groups over the season’s second half.