Marisnick was promoted from Double-A Jacksonville in late July, and in 40 big league games, he is batting .183.
In addition, outfielder Christian Yelich will undergo a minor procedure on Monday to remove a stye from his right eye. The stye surfaced in July, around the time of the All-Star Game.
As did Marisnick, Yelich opened the season at Double-A Jacksonville before being promoted to the big leagues in late July. He's become the regular left fielder, and is batting .288 since his promotion.