As you're no doubt aware, it's already been a frenzied offseason in Major League Baseball. Things figure to quiet down over the coming week for the holidays, but there's still enough time left for teams to get some last-minute shopping done. To get you up to speed on what's buzzing for Monday, we're here to run down the latest rumors. Let's jump in. 

White Sox interested in Castellanos

The White Sox have had an eventful winter already, signing Yasmani Grandal, Dallas Keuchel, and Gio Gonzalez to shore up their run-prevention units. Next on Chicago's to-do list? How about adding a bat. 

The White Sox remain interested in outfielder Nicholas Castellanos, according to MLB Network's Jon Morosi. Castellanos is familiar with both the AL Central and Chicago, having spent most of his career with the Tigers prior to a trade last summer to the Cubs. Castellanos improved his stock after that deal, going on a tear that lasted the rest of the season.

Castellanos is expected to receive a contract worth more than $50 million.

Royals acquire Adams

The Royals have acquired right-hander pitcher Chance Adams from the Yankees, the club announced. Adams, once a well-regarded prospect, has struggled to make an impact at the big-league level. He's only 25 years old and he has a high-spin fastball, so perhaps he'll find the pastures of Kansas City to be of a healthier color. 

Adams had been designated for assignment when the Gerrit Cole deal was made official.

Marlins ink Cervelli

The Marlins have agreed to terms with free-agent catcher Francisco Cervelli on a one-year deal worth $2 million, per MLB.com's Mark Feinsand. 

Cervelli, who will serve as Jorge Alfaro's backup, is coming off an injury-shortened season that he split between the Pirates and Braves. When healthy, he's been an on-base machine who has historically graded well as a receiver (albeit not as well in recent seasons). 

Cervelli is just the latest veteran addition for the Marlins, joining a group that includes Jonathan Villar, Jesus Aguilar and Yimi Garcia. No one is going to confuse Miami for a contender, but those are modest additions who should provide the fan base with a more entertaining product.

Padres sign Johnson

The Padres have agreed to terms on a two-year pact with right-hander Pierce Johnson. The deal is worth around $5 million guaranteed, according to ESPN's Jeff Passan. 

Johnson, 28, has appeared in 38 big-league games during his career, albeit without much luck. He spent last season with the Hanshin Tigers, throwing 58 innings and posting a 1.38 ERA and 7.00 strikeout-to-walk ratio.

During Johnson's most recent big-league tour, he relied upon three pitches: a mid-90s fastball with good spin, a curveball and a cutter. Though he has past experience as a starter, he's likely to occupy a spot in San Diego's bullpen.