Triple-A Iowa placed Mervis on its 7-day injured list July 4 with an apparent hand injury, Tommy Birch of The Des Moines Register reports.
The Triple-A club hasn't provided official word on the nature of Mervis' injury, though Birch notes that the first baseman is suspected to be dealing with a broken hamate bone. Since being optioned to Iowa on May 4 after an abbreviated stint with the Cubs, Mervis was slashing .215/.286/.424 with eight home runs and a 26.7-percent strikeout rate over 37 games.