The Cubs have placed infielder Matt Duffy on the COVID-19 list and selected the contract of fellow infelder Ildemaro Vargas from their alternate site, Sahadev Sharma of The Athletic tweets.

Duffy is the fourth Cubs player to land on the COVID list this week, joining pitchers Jason Adam, Brandon Workman and Dan Winkler. As Sharma notes, though, it doesn’t necessarily mean Duffy tested positive.

Chicago claimed Vargas via waivers from the Twins last September, but he lost his 40-man roster spot when the Cubs designated him for assignment in March. Vargas remained with the organization after clearing waivers. Also a former Diamondback, the light-hitting Vargas carries a .254/.282/.391 line in 298 plate appearances, though he does offer plenty of defensive versatility in the infield.