The former club captain was handed the reins following John McGlynn's sacking and, as things stand, is due to lead the team to Easter Road for the Clydesdale Bank Premier League meeting with Hibernian.
However, club legend John Robertson, former Tynecastle assistant boss Peter Houston and sacked Bristol City manager Derek McInnes are all reported to be on a shortlist to takeover the Gorgie dugout role. And Locke claims he has had no information as to whether an appointment will be made ahead of Sunday's match.
He said: "I have no idea. There's nothing happened as far as I know, so we are just taking the line we have done for the last week and a bit. Myself and Darren Murray are in charge for the moment, and if anything happens today or tomorrow then I'm sure the club will let everybody know.
"I'm preparing the team at the moment. If anything happens, then great. If not, then it's business as usual."
Locke made almost 200 appearances for the club as a player but admits leading Hearts into a clash with their city rivals as boss would rank among his proudest moments.
He said: "How proud would I be as a Hearts fan to take the team to Easter Road? It would be great - a fantastic feeling. But I'm not looking too far ahead. I think the club has been talking to people, so we will wait and see what happens over the next 24 to 48 hours.
"If I'm in charge, then great. I'll just prepare the team as I've done the two games previously. If I'm not, hopefully we can still go to Easter Road and get the three points."
Hearts' off-field problems - with failure to pay wages on time, court battles with Her Majesty's Revenue and Customs and boardroom unrest following the news that club owner Vladimir Romanov has resigned as chairman from his Lithuanian holding company UBIG among the many dramas to have enveloped the Edinburgh outfit this year - have been matched by their on-field troubles.
McGlynn was axed after losing 14 of his 34 games in charge, while Tuesday night's 2-0 victory over St Johnstone only came after five straight SPL defeats.