The former Southend wideman picked up a groin injury in winning a penalty at Lincoln last weekend and is a doubt to face the Millers.
On-loan Swansea midfielder Scott Donnelly came off the bench to replace Betsy last week and is contention for his first start in the league since completing his move over the New Year.
Striker Jon-Paul Pittman made his return from a ruptured knee tendon which had kept him out since September in a Senior Cup game in midweek but the game will come too soon for him.
He could feature in the next few weeks to boost the Chairboys' promotion push.
Matt Bloomfield is in line to make his 250th appearance for the club while fellow midfielder Stuart Lewis is available for the final game of his current loan spell from Dagenham.
Source: PA
Source: PA