Miguel Montero (thumb) will begin a rehab assignment with Double-A Tennessee on Sunday.
He's missed the last few weeks with a sprained left thumb. David Ross and Kyle Schwarber have shared time behind the plate during his absence. Montero is only hitting .230 this year with 10 homers and 32 RBI.
Clayton Richard will start Sunday's game against the Brewers.
Richard won't be in the majors long as the Cubs are likely to option him back to Triple-A Iowa when Dan Haren joins the rotation sometime next week. Richard is 1-0 in three appearances for the Cubs this year with a disappointing 5.40 ERA.
White Sox signed OF Dayan Viciedo to a minor league contract.
Viciedo was granted his release from Oakland earlier this week. Chicago has already assigned him to Triple-A Charlotte. This marks Viciedo's second stint with the White Sox after hitting 66 home runs in 483 games for the Pale Hose from 2010 to 2014.
Cubs optioned RHP Yoervis Medina to Triple-A Iowa.
He was with the club for a couple of days to provide emergency bullpen depth, but with Dan Haren joining the club on Saturday he was no longer needed. The right-hander will continue to provide bullpen depth at Triple-A and should get another shot with the big league club later in the summer.
Pirates optioned LHP Bobby LaFromboise to Triple-A Indianapolis.
The left-hander was with the team for just one day and is sent out for J.A. Happ who has joined the team. He'll continue to provide bullpen depth at Triple-A.
Robinson Cano (abdomen) returned to the Marniners starting lineup as the designated hitter on Saturday.
Cano has been sidelined since Monday with a Grade 1 abdominal strain. He still isn't ready to man his position defensively, but can swing the bat without issue. He's hitting cleanup against Kyle Gibson and the Twins on Saturday.
Padres recalled RHP Leonel Campos from Triple-A El Paso.
He'll provide bullpen depth while Ian Kennedy is away on paternity leave. The 28-year-old owns a 2.92 ERA, 0.99 WHIP and 68/21 K/BB ratio over 49 1/3 impressive innings at Triple-A this season.
Padres placed RHP Ian Kennedy on the paternity leave list.
Kennedy was forced to witness his daughter's birth on FaceTime before his start on Friday, then left the team to be with his family. He should rejoin the team in plenty of time to make his next scheduled start.