In the meantime, the Phillies recalled right-hander Colton Murray from Triple-A Lehigh Valley.
"I thought it was going to be something simple," Hinojosa said through the Phillies' interpreter. "The X-ray was negative. I don't have a fracture, so I thought it'd be a matter of two or three days to be back. But that's not the case."
A batted ball struck Hinojosa's pitching hand Thursday against the Nationals at Nationals Park.
"It hit me so hard that it still bothers me," Hinojosa said. "I cannot throw my changeup, my splitter. "
His injury is a blow to the bullpen. Hinojosa is 0-1 with a 3.27 ERA and eight strikeouts in 10 appearances this season. After allowing four hits and two runs in just one-third of an inning in his season debut on April 6 in Cincinnati, he has allowed just six hits, two runs and three walks in 10 2/3 innings.
In his past nine appearances, Hinojosa has a 1.69 ERA and opponents have hit just .171 against him.
"It came to the point where it was going to take a few days longer than we expected," manager Pete Mackanin said about Hinojosa's recovery time. "We didn't want to go short for four or five more days. It just made sense to do it now."
Murray, who made his Major League debut for the Phillies in September, is 0-1 with a 6.10 ERA and 14 strikeouts in 10 1/3 innings for the IronPigs. He posted a 5.87 ERA in eight appearances last season with the Phillies.
Todd Zolecki has covered the Phillies since 2003, and for MLB.com since 2009. Read his Phillies blog The Zo Zone, follow him on Twitter and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.