The Georgia captain has only played two games for Rovers this season although he has played seven for Newcastle while on loan to the Championship outfit.
"We are very pleased to add Zurab to our squad and this is another signing that will add very good experience," director of football Nick Hammond told Reading's official website.
"He can play centre-half, full-back or as a holding midfielder so he also brings excellent versatility and I'm sure he will prove to be a good addition."