GREEN BAY (AP) — When general manager Brian Gutekunst spoke on Sunday afternoon about his first cutdown as general manager, he described the Green Bay Packers’ roster as “fluid.”

He wasn’t kidding.

Gutekunst continued tweaking the 53-man roster on Monday, adding running back Darius Jackson off the Dallas Cowboys’ practice squad and signing linebacker Korey Toomer. Those are an effort to fill two obvious needs in advance of the team’s regular-season opener Sunday night against the Chicago Bears at Lambeau Field.

“It took a little longer than normal,” Packers coach Mike McCarthy said following the team’s first post-training camp practice. “We had a lot of movement there on Saturday into Sunday, (and) we were juggling things. . Obviously, I think our transactions reflect that. So, it’s been a long weekend. (But) we feel really good about the 63 players (including the practice squad) in our locker room and we’ll move forward getting ready for the Bears.”

To make room for Toomer, the Packers placed wide receiver Jake Kumerow on injured reserve. By having Kumerow, a Wisconsin-Whitewater alum who was the star of training camp earlier this summer, on the 53-man roster for a day, he is now eligible to return from IR later this season. NFL rules allow each team to bring a maximum of two players back from IR later in the season.

Kumerow injured his shoulder while crossing the goal line on an 82-yard touchdown Aug. 16 against Pittsburgh.

To accommodate Jackson, the Packers waived cornerback Herb Waters one day after he’d made the initial roster.

Before adding Jackson, a 2016 sixth-round pick from Eastern Michigan who has spent time with the Cowboys and Browns but has never played in an NFL regular-season game, the Packers had only two running backs: second-year back Jamaal Williams, who is set to be the starter, and converted wide receiver Ty Montgomery.