What happened: Chicago is acquiring the right-hander in a trade reported by Jeff Passan, citing ESPN sources. Seattle is receiving reliever Seranthony Dominguez and outfielder Nolan Jones as part of the return.

Why it matters: Chicago is exchanging two major-league players for Luis Castillo. The move shifts a right-hander to the White Sox while sending a reliever and an outfielder to Seattle.

What to watch: Watch for the clubs to complete the reported transaction.