Mondesi, 21, continues to progress slowly at the plate. He did not start against tough Red Sox left-hander David Price on Saturday with Christian Colon starting at second base instead.
Mondesi is hitting .184 through 28 games with a .228 on-base percentage. Royals manager Ned Yost said he can live with that.
"Mondi has been doing fine," he said. " … He helps us win games. That's all I care about it.
"Absolutely [I can live with Mondesi's average]. But it's not going to be .180 [forever]. He's going to get some hits.