The Boston Red Sox have acquired shortstop Adalberto Mondesi from the Kansas City Royals just 15 days after infielder Trevor Story, who was expected to take over at shortstop for longtime Red Sox All-Star Xander Bogaerts, underwent surgery on his throwing arm.As part of the trade, Boston sent left-handed pitcher Josh Taylor to Kansas City. The Red Sox will also acquire a player to be named later or cash considerations from the Royals.Mondesi, 27, signed with the Royals in 2011 and has played his entire career with the club. He made his big league debut in the 2015 World Series, when it seemed as if his future was limitless. But despite elite speed and defense, and showing flashes at the plate, Mondesi was never able to stay healthy, appearing in just 109 games over the past three seasons.Despite having one year left on his deal, Mondesi's future with the Royals was thrown in doubt last season, when he suffered a torn ACL that ended his season in April and heralded prospect Bobby Witt Jr. made his MLB debut. Witt proceeded to hit .252 with 20 homers and 30 stolen bases.Red Sox chief baseball officer Chaim Bloom said Mondesi is still rehabbing from the ACL tear and will arrive in Florida later this week to rehab under the guidance of Boston's medical staff."There is still a ways to go with that," Bloom said. "Our expectation is that he may be a little delayed to start the season, but opening day is still a possibility."The Red Sox hope Mondesi can stay on the field and make good on the promise he showed in 2019, when he hit .263 with nine homers and 43 stolen bases in 102 games."In terms of the talent, the athleticism that he has, it's really top-of-the-scale of anybody who plays big league baseball," Bloom said. "We're excited to get him in the organization, excited to finish this rehab, bring him along the right way, and he has the upside to really, really impact us." The Red Sox have been in the market for shortstop help since Story underwent an internal bracing procedure on his right ulnar collateral ligament on Jan. 9.Bloom said Story experienced pain in his throwing elbow shortly before Christmas while ramping up his throwing program in preparation for the 2023 season.The internal brace procedure repairs an existing UCL instead of a full reconstruction involved in Tommy John surgery. The less-invasive option has the potential to allow for quicker recovery. ESPN's Jeff Passan reported that players generally miss four to six months following the type of surgery Story underwent, but Bloom said he did not want to put a timetable on Story's return.Story was expected to be the Red Sox's starting shortstop this season after Bogaerts departed in free agency. Bogaerts, a fan favorite who spent his first 10 MLB seasons with Boston, agreed to join the San Diego Padres on an 11-year, $280 million deal.The trade for Mondesi happened just hours before the Red Sox announced the signing of outfielder Adam Duvall to a one-year contract. The deal between the team and Duvall, which last week was reported to be worth at least $7 million, was pending a physical and reportedly includes up to an additional $3 million in possible performance bonuses. Duvall, 34, was an All-Star with the Cincinnati Reds in 2016 and won a Gold Glove for the Atlanta Braves in 2021, batting .228 with 38 homer runs and National League-leading 113 runs batted in to help lead them to a World Series championship. The addition of Duvall gives the Red Sox the ability to make starting center fielder Kiké Hernández, who has played every position aside from catcher in the major leagues, the team's starting shortstop. With the addition of Mondesi, Boston has the flexibility to rotate Hernández to second base or put him back in center field during the season.Taylor, 30, missed all of last season with a back injury, but he was stellar over the previous three seasons in Boston, with a 3.69 ERA and 129 strikeouts over 121 appearances. At one point during the 2021 season, he had a streak of 26 consecutive scoreless outings, the longest streak for a left-hander in franchise history.He also pitched in six of 11 postseason games for the Red Sox in '21, allowing one earned run over four innings pitched.“Josh Taylor is someone we've valued for a long time,” Royals general manager J.J. Picollo said. “If you go back and look at what he did in 2019 in Boston and what he did again in 2021 in Boston in a playoff run, it was really really impressive.”Several key members of Boston's 2018 World Series championship team chose to sign elsewhere in free agency. While Bogaerts went to the San Diego Padres, designated hitter J.D. Martinez signed with the Los Angeles Dodgers, and right-handed pitcher Nathan Eovaldi signed with the Texas Rangers.The Red Sox, meanwhile, have signed All-Star closer Kenley Jansen and outfielder Masataka Yoshida, a star player in Japan’s Nippon Professional Baseball league. Boston has also signed All-Star infielder Justin Turner, formerly of the Dodgers, and two-time Cy Young Award winner Corey Kluber. The biggest splash of the Red Sox's offseason was the commitment of $331 million to keep All-Star third baseman Rafael Devers under contract with the team for the next 11 seasons.AP Sports Writer Dave Skretta contributed to this report from Kansas City, Missouri. Additional information from The Associated Press was used in this report.