"We're still going over that. As of right now he is," Chicago manager Robin Ventura said. "We'll continue to sit there and talk about it."
Rienzo has lost five straight starts, most recently allowing four earned runs in just 4 1/3 innings during a loss to the Twins on Saturday. During the five-game skid, he has pitched 22 1/3 innings, allowed 22 earned runs and allowed opponents to bat .361 with a .557 slugging percentage.
Rienzo started the season well, winning his first four decisions, but the five losses have brought his record to 4-5 with a 5.86 ERA. If the Sox opt to replace him in the rotation, it is unlikely they would call up a replacement from Triple-A Charlotte. Pitcher Scott Carroll, who was moved to the bullpen after making five starts, would likely be Rienzo's replacement.
"Just where we sit right now," Ventura said, "it would be him if we did it."
Carroll went 1-3 with a 6.15 ERA as a starter. In six appearances out of the bullpen, the righty has a 1.83 ERA and .224 batting average against.
"You don't pitch quite as much, but you're able to still be a little fresher," Ventura said. "He's added his cutter. That just becomes a little bit better for him. Once you work on your sinker, you add a cutter to it, there's more things to look for."
David Wilson is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.