Phillips is "99.9 per cent sure" he will retire at the end of this coming season.
Retiring on top is how the striker always wanted to leave the game and hopes he can help Palace avoid relegation - ambitions that means there will be no extravagant birthday celebrations this Thursday.
"My family, my missus and my kids want to do something but, ever the professional, I don't want to celebrate," he said. "I'll be training on Thursday.
"I will probably wait until the first international break and look to do something then.
"For now, I am fully focused on getting completely match fit and I don't want to let anyone down this season.
"It will almost certainly be my last season and I want to go out with a bang."