Doumit was scheduled to make his third rehab appearance on Thursday, but Triple-A Indianapolis' game was rained out in Durham. A doubleheader has been scheduled for Friday, with Doumit scheduled to play in both games.
General manager Neal Huntington said that Doumit will serve as Indianapolis' catcher in the first game, possibly finishing the contest in right field. Doumit will then be the team's designated hitter in the second contest.
If all goes well, he will then travel to Pittsburgh in time for Saturday's night game against the Rockies. Even before Thursday's rainout, the Pirates were not planning on bringing Doumit back until the weekend.
"The first day down there was a little rough," Huntington said. "It's tough for any player to sit for 15 days and come back to the Major League level. At this point, we're expecting today and tomorrow out of Ryan, and look to activate him on Saturday."
In his first two rehab games, Doumit went 0-for-8 with two strikeouts. He did not have any balls hit to him in his start in right field.
When Doumit is activated, manager John Russell will have the challenge of finding playing time for him as a catcher and right fielder. Chris Snyder is expected to continue to get the majority of playing time behind the plate.
Pittsburgh will have to make a roster move on Saturday to make space for Doumit's return. If the club elects to keep three catchers -- as Huntington has previously suggested they will -- Jeff Clement will likely be squeezed out of a spot. If the Pirates decide to keep only two backstops, Erik Kratz would be the odd man out.