Riley (hamstring) has been missing since the 2-1 triumph at Southend at the start of January - a result which is part of a seven-match unbeaten run away from home for the Robins.
The influential centre-back has been training all week and comes into the fold as manager Mark Yates looks for a response following Tuesday`s 2-1 defeat at home to Lincoln.
Riley`s return leaves just Andy Gallinagh on the sidelines, with the defender having undergone a successful double hernia operation on Tuesday which is expected to keep him out of action for around three to four weeks.
Source: PA
Source: PA