Betancourt, nursing an abdominal strain, did not pitch on Tuesday.
"It's still sore," he said. "We're going to do the same thing today -- rest, treatment, ice."
The right-hander blew his fourth save of the year on Monday, when he yielded a run against Atlanta, but he also ended up with his fourth win after the Rockies rallied. His strikeout-walk ratio of 9.57-1 (67 strikeouts, seven walks) is the second-best ratio among big league relievers.
"We really want to be proactive with this one," Rockies manager Jim Tracy said. "By staying away today and having the day off tomorrow, we'll have a much better idea on Friday. Hopefully, he's going to come in and be fine."
In other Rockies pitchers injury news, starter Jeff Francis threw long toss on Wednesday morning while reliever Matt Daley threw a bullpen session on Tuesday. Aaron Cook remains scheduled to start for Double-A Tulsa on Saturday and Taylor Buchholz was in Denver for treatment Wednesday.