England captain Alastair Cook and fast bowler Stuart Broad sat out training on Tuesday as a precautionary measure to try and alleviate discomfort in back injuries.
Cook and Broad both stiffened up after the long flight from London to Perth last week and were being monitored and treated by the England Cricket Board's medical staff.
However, Cook's absence is not likely to cast doubt on his participation in the upcoming Ashes series in Australia, according to fellow batsman Ian Bell.
Cook chose to skip England's scheduled session at the Floreat Oval in order to receive treatment on the complaint.
"I'm sure he'll be fine," Bell told Sky Sports News. "He's had the odd little niggle with the back, which I suppose we all have certain areas we have to keep working on.
"Obviously a long flight isn't always easy. I'm sure he'll be right in the next week or so."
England have no shortage of pace bowling options available to them, with uncapped Boyd Rankin joining Steven Finn and Chris Tremlett in battling for the final berth in the bowling attack while the injured Tim Bresnan will likely be waiting in the wings.
Captain Cook revealed there was even a chance the Yorkshireman could be back to full fitness come the opener in Queensland although they will not know until they see how his back reacts when he begins bowling again.
Cook hopes to see his squad making the most of their opportunities in the warm-up games but, due to a clash with a state game it will be a second string who line up to face the tourists in a Western Australia President's XI at the WACA on Thursday.
However the 28-year-old was not concerned as there is plenty of time to acclimatise to the conditions and he said: "It was very similar to what we did last time in 2010 - three warm-up games should give you enough time for some time in the middle and some miles in the legs for the bowlers.
"We've got a long build-up, I think you need that for such an important tour."
Watch the Ashes live on Sky Sports this winter, beginning with the opening Test at the Gabba. Coverage begins at 11pm on Sky Sports HD2 on November 20