Three first-choice players have been struggling with injuries, with Graeme Swann and Tim Bresnan both recovering from elbow trouble and Kevin Pietersen coming back from a knee complaint. But Miller, casting his eye over the talent on the first day of the County Championship season, is confident all three will be back soon.
Miller told Sky Spots News: "We will be ready when New Zealand come around, we have strength in depth to cope, then we've got the Champions Trophy and the public can be sure we'll be ready for Australia when they arrive."
Swann is expected to start bowling again by the end of the month, while Bresnan and Pietersen will also be attempting to prove their fitness before the Test series against New Zealand in May.
Following that is the final Champions Trophy, on home turf, and the hotly-anticipated Ashes.
"It was a nasty injury for Kevin but it's been rectified and the medical staff will continue with that. He'll be fine," Miller added on Sky Sports News.
"I talked to Graeme Swann the other night and he's fine and Bressie will be starting with Yorkshire very soon.
"For the medical staff as well as the playing staff it is full on to make sure everyone is fit."