It’s pretty rare these days when MLB teams get to announce a big transaction on their own, as most things leak out ahead of time, and we get a few days of speculation before a deal is finally complete. But this morning, the White Sox just threw out a shocker.

#WhiteSox have acquired OF Eloy Jiménez, RHP Dylan Cease, 1B Matt Rose & INF Bryant Flete from the Cubs in exchange for LHP José Quintana. — Chicago White Sox (@whitesox) July 13, 2017

We were pretty sure the White Sox were going to trade Quintana, and it seemed pretty clear the Cubs needed another starting pitcher, but the presumption was that the Chicago teams wouldn’t strike a deal, given their history of not really making trades together. They hadn’t completed a trade between teams since 2006, when Neal Cotts was traded for David Aardsma, and before that, it was 1998’s Matt Karchner for Jon Garland deal.

But this time, apparently, the fit was too perfect to pass up just because they share a city. The White Sox wanted to continue to load up on future upside, and there are few prospects in the game with more long-term value than Jimenez, who Baseball America just ranked #5 overall in their midseason update. Eric Longenhagen put a 60 FV on him before the season began, and he’s gone on to hit .271/.351/.490 as a 20-year-old in high-A ball. He’s still several years from the big leagues, but he’s got some of the biggest power upside in the minors, and the White Sox have time to be patient.

Cease is a pretty nifty second piece himself, as a 21-year-old who can get his fastball into the high-90s and was destroying the Midwest League this year. Like Jimenez, he’s got a ways to go before he’s a big leaguer, but there’s plenty of potential here.

Rose and Flete are your typical add-ons in trades like this. Neither one even made the honorable mentions section of Eric’s Cubs list this spring, and it would take some unexpected development for either to become a contributor in the big leagues. This deal is about Jimenez and Cease.

As expected, Quintana didn’t bring back quite the return that Chris Sale did, but this looks like a very nice return for the White Sox. They continue to pick upside and long-term value over proximity to the Majors, and when you collect prospects like this, your success rate will naturally be lower. But if they hit on a few of the guys they’ve acquired over the last year, they’re going to find a franchise player or two to build around. With Moncada, Jimenez, Kopech, Cease, Giolito, and Lopez, the White Sox have six pretty interesting upside plays to hope on now.

Jeff will be around in a bit with a longer write-up on this deal, and will focus more on how this helps the Cubs. But they needed another good pitcher, and now they have one they can keep around for a few more years. The Dodgers and Nationals shouldn’t forget about the Cubs just yet.