Watch as England & Wales Cricket Board National Selector reveals England's Ashes squad and explains why Monty Panesar was included and Nick Compton wasn't.
England's 17-man squad will instead feature Michael Carberry as the reserve opening batsman and uncapped Gary Ballance as another batting option.
Despite well-publicised off-the-field incidents, Panesar has been picked to tour alongside Graeme Swann as Lancashire's Simon Kerrigan misses out.
"Monty had his problems which we've worked hard to rectify in the last six weeks or so," Miller said. "He's a proven international bowler. He's shown what he's capable of doing on many occasions for us.
"From a selection point of view, he know what's expected of him and I'm sure he'll work hard to produce the goods for us."
Compton played four Tests against India last year and five against New Zealand earlier this year but made way for Joe Root at the top of the order once Australia arrived.
"He's (Compton) done partly what he needed to do," Miller added. "It's a difficult decision obviously, there are lots of players up for selection and didn't quite make it and they are difficult decisions but ones selectors have to make.
"Unfortunately for him, and he was disappointed obviously when I talked to him and explained the situation, disappointed not to be selected but we can only select the ones we think are.
"He's not out of the picture, the door's not closed on him, which he's been made aware of."
Video courtesy of SNTV
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