The Pirates placed Stallings on the 7-day concussion injured list Sunday.
Stallings isn't believed to have a lengthy history of concussions, so the expectation is that he'll be fully cleared to resume baseball activities early in the offseason. He'll wrap up the 2019 campaign with a .248/.326/.376 slash line with three home runs and 18 RBI across 143 plate appearances over 42 games.