10:24pm: It appears to be a two-team trade after all. Wittenmyer reports that pitching prospect Adam Serwinowski is the other player headed to Tampa Bay.

10:17pm: Righty Brian Van Belle is the player from Cincinnati’s 40-man roster who is headed to Tampa Bay, Wittenmyer reports.

10:16pm: There’s an unidentified third team involved, reports Bob Nightengale of USA Today.

10:05pm: Gordon Wittenmyer of The Cincinnati Enquirer reports that at least of the two players headed back to the Rays is a big leaguer.

9:38pm: The Reds are finalizing a deal to acquire starter Zack Littell from Tampa Bay, reports Jeff Passan of ESPN. There’s an agreement in place pending medical reviews, Passan adds. The Rays will receive two players in return, reports MLB.com’s Mark Feinsand.

Littell tossed five scoreless innings tonight against the Yankees in what’ll be his final appearance with the Rays. That lowered his earned run average to an impressive 3.58 mark across 22 starts. Littell turned in a very similar 3.63 ERA in 29 appearances a season ago. He has led the Rays in innings in each of the past two seasons while turning in steady mid-rotation results.

It’s excellent work for a player whom the Rays snagged off waivers from the Red Sox a little over two years ago. Littell had bounced around the league mostly as a middle reliever before Tampa Bay built him up as a starter. His fantastic control played well in a rotation role. Throwing strikes is the 29-year-old’s standout trait. Littell has walked fewer than 5% of opposing hitters in consecutive seasons. He issued four free passes tonight in the Bronx, but that’s only the second time he has done so in the past two years.

Littell doesn’t have eye-popping stuff. He sits in the 91-92 MPH with both his four-seam fastball and sinker. Neither his slider nor splitter are huge swing-and-miss offerings. Littell had roughly average strikeout and whiff rates a season ago. This year’s 16.6% strikeout rate and 9.1% swinging strike percentage are each subpar. Littell surrenders a lot of hard contact and has had issues with the home run ball throughout his career. That includes an MLB-high 26 longballs allowed this season.

That profile seems a suboptimal fit for a pitcher who’ll now call the extremely hitter-friendly Great American Ball Park home. Littell’s consistency was clearly a plus for Cincinnati. He has worked at least five innings in all but one start this year. He has allowed three or fewer runs in 18 of 22 appearances. Littell has had a better season than Nick Martinez and Brady Singer have managed. Rookie Chase Burns has also been up and down over his first six starts.

Adding Littell could push Martinez to the bullpen. Ace Hunter Greene is on a rehab assignment as he works back from a groin strain. That’ll presumably push Burns back to Triple-A. Cincinnati would have a starting five of Greene, Nick Lodolo, Andrew Abbott, Littell and Singer at that point.

Littell is playing on a $5.72MM salary for his final year of arbitration. The Reds are taking on a little more than $1.8MM for the final two months. He’ll be a free agent at season’s end. Tampa Bay wasn’t going to make him a qualifying offer. They’ve played terribly this month and dropped below .500 with tonight’s loss. Their 3.5 game deficit in the Wild Card race isn’t insurmountable, but the team’s performance coming out of the All-Star Break discouraged the front office enough that they’re at least soft sellers.

More to come.