Csaba Laszlo told Hearts News: "Fortunately, it's just an ankle knock.
"It's obviously a concern when you must check a player with a scan, but David is fine.
"We are disappointed that he probably won't be fit for Saturday, but relieved it's nothing more than a knock."
The news on Templeton came 24 hours after full-back Craig Thompson was ruled out for another eight weeks following knee surgery.
Hearts are hoping defenders Marius Zaliukas and Jose Goncalves will recover from injury in time for this weekend's trip to Ibrox.
Source: Team Talk
Source: Team Talk