5:40pm: Pittsburgh will get five players in return, Jon Heyman of MLB Network reports. Head and lefty Omar Cruz are among those going to the Pirates, per Dennis Lin of The Athletic. Southpaw Joey Lucchesi will also go to Pittsburgh, Kevin Acee of the San Diego Union-Tribune reports, as will righties David Bednar and and Drake Fellows, Lin relays.
5:18pm: The Padres have agreed to acquire right-hander Joe Musgrove from the Pirates, Jeff Passan of ESPN tweets. The Pirates will receive “a large package of prospects,” potentially including outfielder Hudson Head, according to Passan.
More to come.