Paronto, who will have to clear waviers before the Astros can send him back to Triple-A Round Rock, allowed two runs on four hits and struck out one batter in two innings on Saturday. He surrendered a solo home run to Omir Santos, who was the first batter he faced, in the sixth inning.
"We didn't want to try and use guys who usually pitch in the seventh, eighth and ninth inning [on Saturday], and Paronto stepped up and gave us a couple of innings and so did Wesley [Wright]," manager Cecil Cooper said. "There's not much you can do. You just try to map it out where you don't use a bunch of guys."
In two games, Paronto allowed six runs over 2 1/3 innings pitched for the Astros since being recalled after the All-Star break.
Sampson, who's been on the disabled list retroactive to July 10 with right shoulder spasms and is eligible to come off the DL on Sunday, should add a boost to the Astros bullpen. He is 4-1 with a 3.02 ERA and 27 strikeouts in 41 appearances for Houston.
Jason Grodsky is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.