White Sox will trade Marcus Semien, Chris Bassitt, and a third player to be named for A's pitcher Jeff Samardzija

The Athletics will receive infielder Marcus Semien, right-handed pitcher Chris Bassitt, and likely a third player to be named from the Chicago White Sox in exchange for starting pitcher Jeff Samardzija to the Chicago White Sox, big league sources tell Susan Slusser of the San Francisco Chronicle (two tweets). The final deal will probably be announced Tuesday.

Semien, 24, will became the A's new shortstop. He will be under team control through the 2020 season, and is unlikely to be arbitration eligible before 2018. Semien exceeded his rookie limits in 2014, though he has only played 85 games and made 326 plate appearances, batting .240/.293/.380 for a career wRC+ of 86, according to Fangraphs.

Bassitt, turning 26 next year, made five starts for the White Sox, going 1-1 with a 3.94 ERA in 29⅔ innings pitched, with a FIP of 3.33 (but an xFIP of 4.67). Bassitt pitched in the Arizona Fall League for 13 innings and posted a 0.69 ERA with 22 strikeouts before he was removed from the AFL roster due to "discomfort in his left foot that is not believed to be serious," according to Mark Gonzales of the Chicago Tribune.

With a tip of the hat to Chris Kusiolek, here's a gif-heavy scouting report on Bassitt by Nathaniel Stoltz of Rotographs:

Article on Bassitt from @stoltz_baseball last winter http://t.co/QuMvmdwDrF

— Chris Kusiolek (@Oak_AllDay) December 9, 2014

False report confuses matters

Confusion reigned Monday night when a twitter account impersonating FOX Sports national baseball writer Ken Rosenthal tweeted specific details of a completed trade despite earlier statements from national writers and Athletics beat writers that no deal would be announced until Tuesday:

This is a fake account. MT @Ken_RosenthaIl: #A's send Samardzija to the #WhiteSox for Marcus Semien, Trayce Thompson, and Chris Beck.

— Jeremy F. Koo (@jfkooAN) December 9, 2014

The real Rosenthal has only one 'l' in his name, and no capital 'i'.

For more details, Deadspin has laid out the evening's timeline of events.

We'll have complete details on the official trade when those details are known.