Holroyd is Stevenage's top goalscorer after netting six times in eleven games since his summer loan switch from Brighton and is back in contention after sitting out the FA Cup win at AFC Wimbledon.
21-year-old midfielder Walker meanwhile was impressive in that cup fixture, having made a loan move from Watford only days earlier. The Middlesbrough youth prospect opened the scoring from a free-kick and was a major presence in the middle of the park.
Stevenage have made a solid start to their debut season in the Football League and lie 11th prior to Saturday's game and have proved hard to beat with 9 draws from their 18 games to date.