Aybar fouled a ball off his right big toe during Saturday's game with the Texas Rangers. He finished the at-bat, but was replaced the following inning by Maicer Izturis. The Angels were waiting for results of X-rays before deciding whether to put Aybar on the DL.
Aybar will be out at least three games, the Angels said. Izturis will start Sunday night's game against the Rangers at shortstop.
"It's sore," Aybar said. "I might have fouled balls off my foot before, but not like this. We'll wait two or three days and see what happens."
Segura, 22, is generally regarded as the Angels' top minor-league position player. He was batting .294 with 33 stolen bases, seven home runs and 40 RBIs at Double-A.
The Angels called down to Arkansas on Saturday night, and Segura was taken out of the game in the seventh inning. With the Angels searching hard for pitching before the July 31 non-waiver trade deadline, his name has surfaced in trade rumors.
"I thought I got traded," Segura said. "They told me I'm in the big leagues, and I'm happy."
The Angels optioned pitcher David Carpenter to Triple-A Salt Lake.