Geraghty returned after a six-week lay-off with a serious ankle injury.
And the inside centre, who was replaced after 60 minutes in this defeat, is in England’s squad for the autumn Tests.
But Booth said: “He needs a series of games before he’s thrust into the next level up and can spark an England revival.”
Matthew Jones ran the Worcester show and Miles Benjamin bagged two tries.
Warriors chief Mike Ruddock said: “Matthew made really good decisions and grew in confidence. You could tell by his body language.”