Scrum-half Webb is in line to face Leicester Tigers in their Heineken Cup opener at Welford Road on Sunday.
And his impressive start to the season in the absence of crocked stars Phillips and New Zealander Jamie Nutbrown has alerted Wales coach Warren Gatland ahead of the Autumn Tests.
Webb, 19, said: “It will be one of the biggest games of my life. My form has been good and I want to continue to show everyone what I can do.
“I’m thriving on the opportunity and feel I’ve stepped up to the mark. Regional rugby is a lot faster, physical and more structured and I’m no longer running around like a headless sheep.
“It is every boy’s dream to play for Wales and I’m no different.”
