The 41-year-old, who became Hibs manager this summer, fell ill earlier this week and will now undergo a period of recovery, with his assistants Jamie McAllister and Adam Owen taking the first team with the support of David Gray.
Via the Hibs website, Johnson said: “I’d like to thank all the staff in Edinburgh Royal Infirmary, especially the Hibs fans that looked after me along the way.
“I’m hoping to make a swift recovery and be back in the dugout as quickly as possible.
“Having never missed a game previously in management, obviously I’m frustrated at not being able to be physically attending Easter Road tomorrow.
“However, I am 100% with every player, staff member, and supporter in spirit to fight for a very important three points. GGTTH.”