Trevor Bayliss admitted he had a ‘stern chat’ with England's players after they nearly avoided a defeat in their inaugural Test against Ireland at Lord’s.
England were skittled out for 85 in the first session but eventually managed a 143-run win after bowling out the opposition for just 38 in the second innings.
Jack Leach, who was promoted as England’s nightwatchman in second innings, was England's top-scorer in the match with 92 and although he couldn’t make it to the 14-man Ashes squad, Bayliss praised the left-arm spinner's approach to batting under tough conditions.
"We had a fairly stern chat after the game," Bayliss told BBC Radio.
"It's good to be able to deliver those messages when you have actually won a game," he said.
"I thought the example Jack Leach showed was the example a lot of the other batters need to learn from. He was very focused on what he wanted to do and was very clear in his own mind how he was going to go about it.
"We speak about that a lot, having a plan for any situation you find yourself in and being clear with your thoughts -- don't try and just bluff your way through it."
England kick off their preparations for the Ashes with an optional training session on Monday at Edgbaston, where Archer’s fitness will be assessed following a side strain he picked up during the successful World Cup campaign.
"We don't want to necessarily risk him," Bayliss said.
"He played for Sussex in a T20 match and came through that well. Test match cricket, five days, longer spells, is a little bit of a different beast so we'll have to see where he's at and take a little bit from the medical people as well.
"We have to weigh up, do you pick him for the first one, it's a bit early, he gets injured and then is unavailable for selection?
"We've got a good strong group of bowlers who we think can do the job over the five Tests."