The 19-year-old has agreed a deal until the end of the season at Huish Park and could make his debut when the Glovers travel to Dagenham on Saturday.
German has been at Rangers since he was 14 and made his debut against Southampton aged just 17.
But he has made only three appearances for the Championship leaders this season and recently had a spell on loan with Southend.
Source: PA
Source: PA