The Magpies host West Ham at St. James' Park on Monday night as they look to extend their 3-game winning streak. Howe has had a major boost with the return of Miley who he thinks has evolved after recovering from injury.
Miley has not played a full 90 minutes for the club since late February and has only managed a single minute of football since March.
"His game will be developing every day, and I think it's in a good place," said Howe.
"But I think his biggest development is physical. He's worked really hard through his injury. He looks an unbelievable athlete now. To play for England Under-21s at 18 is a testament to how England regard him. I think his career is in a good place."
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