Hanigan's stint was made retroactive to July 9, as he sat out Tampa Bay's final four games before the All-Star break, but Rays manager Joe Maddon couldn't guarantee that Hanigan would be back after the minimum 15 days.
Hanigan missed time earlier this season with a right hamstring strain, sitting out from May 27-June 11. The 33-year-old catcher, acquired in a three-way trade this past offseason, has hit .212/.309/.327 with four homers and 27 RBIs in 61 games.
"It's tough. We just can't get him going," Maddon said. "He started out so well and then we lost him for a bit, and then he came back and was starting to feel really good.
"It's difficult, but we've had to fight through moments like this before. Hanny's so involved in the game, talking about moment by moment. Brings a lot of definite intensity to the group, so we're going to miss him. We're going to miss him again. But we'll get him well and see if that gets him ready for that stretch drive."
Casali, 24, was hitting .237 with three homers and 15 RBIs in 46 games for Durham. He will be making his Major League debut with the Rays.
Adam Berry is a reporter for MLB.com. Follow him on Twitter at @adamdberry. This story was not subject to the approval of Major League Baseball or its clubs.