The Brewers saw their winning streak come to an end at the hands of the Reds on Saturday night.
Milwaukee stayed 1 1/2 games back of Pittsburgh for the second NL wild card.
Thursday will be the first time the Brewers will be screening all fans.
The Brewers rode a solid performance from pitcher Wily Peralta to a win on Wednesday night.
The new security procedures are required by Major League Baseball.
Milwaukee lost for the 12th time in 13 games.
The New York Yankees celebrate Derek Jeter Day at Yankee Stadium, Sept. 7, 2014.
The Brewers fell 9-1 to the Cardinals Sunday. The loss is Milwaukee’s eleventh in twelve games.
The Brewers fell 5-3 to the Cardinals on Saturday night. The loss is Milwaukee’s tenth in eleven games.
Milwaukee moved one game ahead of Atlanta for the NL’s second wild-card spot.