Villa have already brought in one new player this summer, with John Terry arriving.
And it seems that more new additions are heading to Villa in the near future.
Bruce said: "When you play for a big club, or you manage a big club like Aston Villa, then you have to have big players who can handle that.
"I hope we can do a bit of business pretty soon.
"If you can get the players in early and get them settled before the season starts it’s obviously an enormous help.
"We hope to be able to announce to something in the next 24 to 48 hours."
Johnstone spent the back end of last season on loan to Vila, and impressed during his stint at Villa Park.
Johnstone will go into the new campaign as Villa’s number one, and strengthen Bruce’s goalkeeping options considerably.
At the moment the claret and blues have a shortage of viable players to start in goal.
Villa kick off their season with a match against Hull City at the start of August.
Bruce’s side have been in Portugal on pre-season training, over the past week.