"I have nothing to lose."
Watson's 94-ball 90 in a tour match against Somerset last week looks to have swayed Lehmann, who has called time - for now at least - on the opening partnership of Ed Cowan and Warner that Australia has relied on for the past 18 months.
Warner's place was always in jeopardy after he was fined and suspended for swinging at Root in a late-night incident after a Champions Trophy match between the Ashes rivals in Birmingham.
His ban expires in time for him to be available for the first test, starting on July 10, but he would have gone into the match with no form or match sharpness.
Cowan and Warner could yet bat further down the order, with Lehmann only confirming the names of his openers for the first test.
"There's not many [question marks] now, we're pretty comfortable with it," Lehmann said.
"We're pretty close. It's one or two [places] and we'll work those out over the next four or five days."
Australia play Worcestershire in a final tour match, starting late last night.
England star Graeme Swann suffered heavy bruising to his right forearm when struck by a bouncer in their warmup game against Essex. However he has been cleared of a fracture.
- AAP