The Pirates placed Cruz (fibula) on the 10-day injured list Monday.
Cruz had surgery Sunday to repair a fractured left fibula and damaged syndesmosis. He's expected to be sidelined for about four months, so the Pirates are likely to move him to the 60-day IL once they need to free up a spot on the 40-man roster. Rodolfo Castro is expected to see the lion's share of playing time at shortstop for the Pirates while Cruz is out.