However, Joe Widdowson's knee injury means the defender remains a doubt for Thursday night's clash at Sixfields.
Captain and centre-half Langmead (knee), striker Platt (calf) and midfielder Demontagnac (hamstring) have all been absent in recent weeks but they resumed training on Tuesday to put themselves in the frame for selection against the Robins.
Leading goalscorer Adebayo Akinfenwa and key midfielder Chris Hackett are strong contenders to return to the starting line-up having been rested for recent matches.
Alex Nicholls is the only player who is definitely not available as the striker continues to recover from a broken leg.
- Sports & Recreation
- Adebayo Akinfenwa
- Joe Widdowson