The Reds also purchased the contract of catcher Corky Miller from Triple-A Louisville and optioned infielder Drew Sutton to the Bats. To make room on the 40-man roster for Miller, Chris Dickerson was transferred from the 15-day disabled list to the 60-day list.
Hanigan sustained the injury on the tip of his thumb while sliding into second base trying to break up a double play in the fourth inning of Friday's 15-6 win over Houston. Hanigan, who is hitting .351 and already has set a single-season career high with 17 RBIs, stayed in the game and even doubled in the eighth inning.
Miller hit .287 with four homers and 24 RBIs in 30 games with the Bats this season.
Janish was placed on the bereavement list Wednesday so he could attend the funeral of his grandmother in Houston. Sutton, recalled to replace Janish, played two games and hit a pinch-hit grand slam Friday.
Dickerson has been sidelined since April 30 after undergoing surgery to clean out his right wrist and remove the fractured hook from the hamate bone of his right hand.