The Red Sox have agreed to acquire All-Star left-hander Chris Sale from the White Sox for infielder Yoan Moncada, right-hander Michael Kopech and two other prospects, a source told MLB.com's Jon Paul Morosi.
MLB Network contributor Ken Rosenthal originally reported the deal. The clubs have not confirmed.
Moncada is the top prospect in baseball, and Kopech was Boston's No. 5-ranked prospectand No. 67 overall according to MLBPipeline.com. The other two prospects going to the White Sox are outfielder Luis Alexander Basabe (ranked No. 8 in Boston's farm system) and right-hander Victor Diaz (No. 28).
Sale, who turns 28 in March, went 17-10 with a 3.34 ERA last season, striking out 233 and walking 45 in 226 2/3 innings.
Moncada, a 21-year-old infielder from Cuba, hit .294/.407/.511 with 15 home runs and 62 RBIs in 106 games between Class A Advanced Salem and Double-A Portland in 2016.
The 20-year-old Kopech, who was Boston's first-round pick in the 2014 Draft, went 4-1 with a 2.08 ERA in 12 starts between Class A Short-Season Lowell and Class A Advanced Salem this past season.
The Nationals had also been in the mix to land Sale, and reportedly were willing to offer their two top prospects -- Lucas Giolito and Victor Robles, ranked No. 3 and No. 10 overall, respectively -- in a package for the southpaw.