The Cubs transferred Maton (knee) to the 60-day injured list Wednesday.
The Cubs have yet to decide whether to build Maton up for a late-season return or shut him down for the year, though the team is expected to make a decision within the next week or so. In the meantime, the Cubs will stash him away on the 60-day IL to free up a 40-man spot for Gabriel Arias, who was claimed off waivers from the Mets on Wednesday.