A blockbuster could be brewing between the Yankees and Oakland Athletics.

According to Ken Rosenthal of FOX Sports, the A's have scouts watching New York's farm system--specifically Class-A Charleston.

Sources: #Athletics recently had top scout watching #Yankees’ Class A Charleston club. Both Sonny Gray and Yonder Alonso would fit NYY well. — Ken Rosenthal (@Ken_Rosenthal) July 17, 2017

Among #Yankees’ prospects at Charleston: OFs Rutherford, Florial; IF Park; RHP F. Perez. OAK surely looking at others in system as well. — Ken Rosenthal (@Ken_Rosenthal) July 17, 2017

GM Brian Cashman has said #Yankees will be “careful buyers.” NYY made offer for Quintana. Stands to reason they also are interested in Gray. — Ken Rosenthal (@Ken_Rosenthal) July 17, 2017

With major needs in the starting rotation and first base, a Yankees-A's swap makes sense.

Sonny Gray, 27, owns a 3.72 ERA across 84.2 innings pitched this season. The right-hander is having his best season since a 2013 rookie cameo for Oakland. Since returning from a disabled list stint in May, Gray owns a 3.04 SO/BB ratio and has struck out over eight batters per nine innings. With Michael Pineda headed for Tommy John surgery, Gray could slide right in and instantly become a difference maker in the Bronx.

Gray is under club control through the 2019 season.

Yonder Alonso, 30, is in the midst of a career year. Heading into play on July 17, the American League All-Star owned a .269/.368/.556 slash line. With an expiring contract, Alonso would be a rental--leaving the future of the position open for a rehabbing Greg Bird in 2018 and beyond.

Joe Giglio may be reached at jgiglio@njadvancemedia.com. Follow him on Twitter @JoeGiglioSports. Find NJ.com on Facebook.