It appeared for a moment that Segura would remain in the game, but he was instead helped to the dugout by Brewers first-base coach Mike Guerrero after complaining of nausea.
"We're going to get him over to a doctor here to make sure that they see the same things our guys are seeing," Roenicke said.
The scare came amid the Brewers' winning rally in what became a 5-3 victory on Sunday at Wrigley Field.
"It scared me," Cubs catcher Miguel Montero said. "I think it broke the helmet, too. As soon as it hit him, I saw a piece of plastic flying around. It was definitely really scary."
Strop was shaken, but was forced to regain his composure to continue pitching with the bases loaded and nobody out. He induced a Ryan Braun double play, with the first out coming at home plate, then walked Adam Lind intentionally to re-load the bases for Aramis Ramirez.
The Brewers caught a break when Ramirez muscled a broken-bat single over third base for the second two of his three RBIs.
Strop received word after the game that it appeared Segura would be OK.
"It was really scary," Strop said. "I heard he's doing all right, and obviously, we saw him stand up, but it was really scary.
"During the process, I had time to breathe and get back to where I needed to be. Their guys helped me out, telling me he was all right. [Carlos] Gomez and [Gerardo] Parra told me, 'He's all right, he's all right, he's all right.' That helped me get back to do what I had to do."
It was Segura's second beaning this season. On April 7, a pitch from Rockies starter Jordan Lyles glanced off the brim of Segura's helmet and struck him in the face. Segura remained in that game and did not miss any time.
"That's two in the helmet. That's not a good thing," Roenicke said. "You hope a guy doesn't get a little tentative in what he's doing. He does such a nice job doing the things we ask that you hope it doesn't start to bother him."