The 18-year-old midfielder joined the League Two high-fliers last month and has made five starts and one substitute appearance to help keep them in the play-off places.
The Baggies have the right to recall Worrall at anytime.
Town manager Paul Simpson said: "I've been pleased with what we've seen from him.
"I think he is enjoying his time here, being around first-team players and playing first team football.
"He's shown enthusiasm and guile on the pitch, and has been a good addition to our squad."