Austin MacPhee insisted he will leave "no stone unturned" as he prepares to face Rangers in the Betfred Cup semi-final.
The interim manager has been placed in charge following the departure of Craig Levein, who was relieved of his duties on Thursday afternoon.
"I'm confident that we can use the next 48 hours as well as we possibly can to prepare the team to give it the best chance of success in the game," Austin told the media.
"The response from the players this morning was fantastic. A lot of them don't train the second day after a game, normally, and they all trained so we hope that we don't leave any stone unturned in the short period that we have to prepare the team."
It's not the first time Austin has taken responsibility of first-team duties, as he stepped in when Craig suffered a heart problems early last season.
"It's not my first rodeo in this role, as an interim manager. The previous experiences have ended well. If they hadn't, Craig would have been the first to tell me about it. I hope Sunday ends well, as well.
"I've been in the game a long time; I've got 600 games as an assistant and I know how these things work. I'm just totally focused on making sure the supporters see a team that's organised, has energy, and has a chance of getting to a Cup final."
Austin was also able to give an update on team news, with the injury list hopefully getting shorter every week.
"Steven [Naismith] trained today. Peter Haring did some training today. Jamie Walker did some training today. The rest of them were okay.
"I felt good about the players today, in particular the senior players. Michael [Smith], Glenn, Christophe, Steven, who play such a big role. Hopefully they'll do that on Sunday. [Steven] could participate."
You can see all of Austin's press conference on HeartsTV for free, by clicking here.