Criswell signed a one-year, $800,000 contract with the Red Sox on Thursday, Robert Murray of FanSided.com reports.

EDGE Analysis

Criswell appeared in seven games for Boston in 2025, finishing the regular season with a 3.57 ERA and 1.58 WHIP through 17.2 innings. He put up similar numbers at Triple-A Worcester (3.70 ERA, 1.35 WHIP) before elbow inflammation put an early end to his season in late August. The 29-year-old righty doesn't have any more minor-league options remaining, so he will have to make the Red Sox's Opening Day roster to avoid losing his 40-man spot.

Criswell was placed on the 7-day injured list by Triple-A Worcester on Wednesday due to right elbow inflammation, Chris Cotillo of MassLive.com reports.

EDGE Analysis

Criswell has spent most of the 2025 season at Triple-A but has appeared in seven games (one start) with the Red Sox, logging a 3.57 ERA, 1.59 WHIP and 9:5 K:BB across 17.2 innings of work. He owns a 4-2 record, 3.70 ERA, 1.34 WHIP and 68:28 K:BB across 65.2 innings at Triple-A.

The Red Sox optioned Criswell to Triple-A Worcester on Saturday.

EDGE Analysis

Criswell fired seven innings of one-run ball Friday against the Astros, but he'll end up as the roster casualty necessary to make room for Dustin May in Boston's rotation. Criswell sports a 3.57 ERA through 17.2 innings with the Red Sox this season and would likely be the next man up if any of Boston's starters need to miss time down the stretch.

Criswell did not factor into the decision in Friday's 2-1 extra-inning win over the Astros, allowing one run on seven hits and two walks with four strikeouts over seven innings.

EDGE Analysis

Criswell allowed just a solo homer in the second inning and otherwise kept the Astros in check, needing only 84 pitches to complete seven strong frames in his first start and seventh major-league appearance of the season. The 29-year-old now owns a 3.57 ERA, 1.58 WHIP and 9:5 K:BB across 17.2 innings with the Red Sox, though Friday's outing was likely just a spot start with Dustin May in line to take the fifth spot in the team's rotation.

Criswell will start Friday's game against the Astros, Chris Cotillo of MassLive.com reports.

EDGE Analysis

The right-hander was called up from Triple-A Worcester on Tuesday and will step into Boston's rotation to fill the spot vacated by Richard Fitts' demotion earlier this week. Criswell, who's worked out of the bullpen in each of his six MLB appearances this year, has a 5.06 ERA, 1.78 WHIP and 5:3 K:BB over 10.2 innings. The 29-year-old righty may be in line for just a spot start, as the newly acquired Dustin May is scheduled to start Sunday's series finale and could stick as the fifth member of the rotation over Criswell moving forward.

The Red Sox recalled Criswell from Triple-A Worcester Tuesday, Chris Cotillo of MassLive.com reports.

EDGE Analysis

Criswell will provide some much-needed length in the Boston bullpen after Richard Fitts lasted only four innings in Monday's loss to the Twins. The veteran righty has made six relief appearances with the Red Sox in 2025, allowing nine runs (six earned) with a 5:3 K:BB over 10.2 frames.

The Red Sox optioned Criswell to Triple-A Worcester on Thursday.

EDGE Analysis

Criswell will return to Worcester after he was called up to serve as the Red Sox's 27th man Wednesday while Boston and Cincinnati resumed a suspended game from Tuesday before playing the series finale. He was expected to work in bulk relief in the second game of the day, but the Red Sox used five other pitchers before Criswell was called upon to record the final five outs of their 8-4 win. He kept the Reds off the board and gave up two hits during his appearance, bringing his ERA and WHIP to 5.06 and 1.78, respectively, through 10.2 innings with the big club.

The Red Sox recalled Criswell from Triple-A Worcester on Wednesday, Jen McCaffrey of The Athletic reports.

EDGE Analysis

Criswell will serve in a bulk-relief role behind opening pitcher Brennan Bernardino in Wednesday's game versus the Reds. The right-hander went five innings and threw 87 pitches Saturday for Worcester, so he won't have a normal starter's workload Wednesday while pitching on short rest. Since Criswell is being designated as the Red Sox's 27th man for the day after Boston and Cincinnati resumed Tuesday's suspended game earlier Wednesday, he's expected to head back to Triple-A immediately after the contest.

Red Sox manager Alex Cora said that Criswell will likely be recalled from Triple-A Worcester to start Wednesday's game versus the Reds following the completion of a suspended game, Jen McCaffrey of The Athletic reports.

EDGE Analysis

Brayan Bello had been scheduled to start the regularly scheduled contest, but he will be handed the ball in the earlier suspended game instead. That leaves Criswell -- who will added as the 27th man -- to start the nightcap, although it's possible an opener is used ahead of him. Criswell would be pitching on three days' rest after going five innings and throwing 87 pitches Saturday for Worcester, so he'd likely have a truncated workload against Cincinnati.

Criswell was optioned to Triple-A Worcester on Saturday.

EDGE Analysis

Criswell has bounced back and forth between Boston and Worcester this season and made two appearances during his most recent stint in the majors. He threw three innings Friday against the Yankees, so the Red Sox will option him and get a fresh arm for their bullpen.