Doug Bollinger and Ryan Harris have both rocketed into contention to play in Adelaide.
Nielsen fell short of guaranteeing Johnson's selection shortly after Harris hit town yesterday afternoon.
Bollinger, who took 3-32 on Monday for New South Wales in Perth, also rolled into the City of Churches yesterday, having pulled out of the Shield match against Western Australia.
Nielsen reacted sarcastically to talk of England's moral victory at the Gabba.
"We're going terribly. We're going awfully," he said.
"I can't believe they said that and I'm not sure we're even going to turn up on Friday."
Asked if he was gutted when he looked at the Gabba scoreboard and saw England's second innings total of 1-517, Nielsen replied: "I look up at the scoreboard and see a draw. In the end, nobody won."
Nielsen declined to make a call on his likely pace attack in Adelaide..
"We've got five fast bowlers here and I'm not going to commit to Mitch playing or not playing," Nielsen said.
"The next couple of days of bowling from all five fast bowlers will play a part in which three get the nod. That will be how they perform in the nets and how they come up physically. By Friday we'll be pretty clear.
"Mitch didn't have his best game in Brisbane but I don't think he was on his Pat Malone there.
"That's our job in the next couple of days, to get him back up and going. There have been players who haven't been able to perform in one Test match and they've come out and upped the ante in their next Test.
Mitchell Johnson Still In Ashes Mix
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