Georgios Samaras, Charlie Mulgrew, Gary Hooper and Fraser Forster will all miss the trip to Dingwall, with Emilio Izaguirre also set to be left out as the champions take a breather before gearing back up for the William Hill Scottish Cup final against Hibernian later in the month.
Hoops assistant boss Mjallby said: "Obviously we know we have the crucial cup final which is the most important game but we still have to keep that winning mentality whoever we pick and have confidence going into the final."
He added: "It is important the players don't take their eye off the ball because that means there will be a wee bit of a holiday mode and we don't want to have that.
"It is not as if we are dismissing the other teams but with having the title in the bag, we have this luxury to pick and choose who we are going to play. We had the chance over the last few weeks to give some key players some time off because it is going to be a record-early return next season.
"We have to be clever, a lot of our players have played a lot of football this season. The break has been good for Joe Ledley, Kris Commons, Efe Ambrose and Kelvin Wilson.
"I know training is different to games but they all looked very fresh. Kris was back in training today and he was a stand-out. I think this break has given them a lot of energy, especially mentally.
"It is a good chance (against County) to play some players who have not had much game time, to show the manager that they want to fight for a jersey and give the manager a headache.
"But from next week and onwards there is going to be a lot of focus on the cup final and preparing the players.
"We are all going to send a message to the players that we still have two league games to go and there will be a more intensive outlook in training."