"He will be in Washington," Brewers Manager Ron Roenicke said. "We'll sit down with him tomorrow and just make sure everything is good before we activate him."
Segura had gone back to the Dominican Republic after his 9-month-old son, Janniel, died.
The Brewers placed infield Jeff Bianchi on the 15-day disabled list with a right elbow strain, which clears a roster space for Segura.
The Texas Rangers recalled opening-day starting catcher J.P. Arencibia from triple-A Round Rock on Thursday, the same day they made the expected move of activating catcher Geovany Soto from the 60-day disabled list.
Struggling first baseman Carlos Pena was designated for assignment after playing only 18 games in his return to the Rangers.
Arencibia was optioned to Round Rock on May 20 after hitting .133 in 20 games with the Rangers, 19 of them starts at catcher. He hit .279 with 14 homers and 41 RBIs in 48 games at Round Rock, where he started 20 games at first base while playing the position professionally for the first time. Eight of his last 11 starts at Triple-A were at first base.
Pena hit .136 and two RBIs in 18 games for Texas, including 16 starts at first base, after being purchased from Round Rock on June 24. ...
The 29-year-old Mills started three games for Oakland this season, going 1-1 with a 4.41 ERA.