England fast bowler Steve Harmison underwent a net session behind closed doors on Tuesday as he tried to rediscover his form following his poor performance in the first Ashes Test.
Media and fans were moved away from the nets in Adelaide to allow Harmison to work alone for 40 minutes with bowling coach Kevin Shine, and even England coach Duncan Fletcher did not attend.
"We have spoken to a lot of people when we've discussed the best way to get it right," Fletcher told reporters.
"We've just got to be very careful that we're working from one way and then suddenly everyone's coming from all sorts of angles.
"It's not an easy thing to fix fast bowlers and if we go in with a whole lot of people coming in now it could be very confusing."
Harmison, who began the series with a wide that ended up at second slip, is not guaranteed a place in the team for the second Test starting in Adelaide on Friday with England considering playing two spinners following their heavy defeat in Brisbane.
"We just have to make those difficult decisions," Fletcher said.
"It could be with two spinners, it could be with a bowling attack with Harmison. He could quite easily bowl well, [Matthew] Hoggard bowls well and Jimmy Anderson bowls well in the nets -- then we've got a bit of a problem as to who we leave out if we go in with two spinners."
Fletcher said England are confident of recovering from the defeat in Brisbane, particularly as they also lost the first Test convincingly in the last Ashes series at home before going on to beat Australia 2-1.
"It's quite strange how there are two parallels here," Fletcher said.
