Martín Maldonado Traded to Cubs, Willson Contreras Hurt? [UPDATES]

Martin Maldonado has been traded from the Royals to the Cubs, Ken Rosenthal reports:
#Cubs get Martín Maldonado, source tells The Athletic. @TheAthleticMLB.
— Ken Rosenthal (@Ken_Rosenthal) July 16, 2019
This at first blush feels like a little bit of an odd fit as Maldonado is a catcher, and the Cubs are covered at that position with Willson Contreras, and at backup Victor Carratini has exceeded expectations. Perhaps this means that Contreras’s foot injury, which has caused him to miss the last two games, could be serious.
Maldonado has a .647 OPS and 1.1 WAR this season thus far. It will be interesting to see what the Royals got in return for him.
UPDATE: The Royals got back pitcher Mike Montgomery:
Source: Royals getting Mike Montgomery back from Cubs for Maldonado.
— Mark Feinsand (@Feinsand) July 16, 2019
UPDATE II: Contreras is heading to IL:
Willson going to IL with a strain of the arch muscle on his right foot. MRI revealed a strain. Medical staff said playing on it could make it worse. Don't expect it to be longer than 10 days.
— Sahadev Sharma (@sahadevsharma) July 16, 2019