Alex Addai is set for a spell on the sidelines having suffered a hamstring injury.
The speedy attacker is expected to be ruled out for between 8 and 10 weeks following a hamstring tear.
He suffered the injury in the club's recent home win over Yeovil Town.
The former Tottenham Hotspur younger, who signed for the Robins in May 2018 from Bostik Premier Divison side Merstham, has made 28 first team appearances this season in all competitions.
He has found the back of the net three times - twice in the FA Cup and in the Checkatrade Trophy knockout round win over Newport County.