Steelbacks skipper David Sales is facing a race against time to be fit for tonight's Twenty20 Cup clash with Somerset Sabres.
Sales had to limp off the field in the penultimate over of Northamptonshire's 11-run win over Worcestershire Royals at Wantage Road on Monday night.
The 28-year-old has strained his ankle and is a doubt for tonight's crucial trip to Taunton as the Steelbacks attempt to qualify for the quarter-finals for the second year running.
Initially Northants thought Sales had no chance of making it for the clash with Somerset, but the damage to the captain's ankle is not as bad as first feared. A scan showed there was no major injury, but the ankle is bruised and swollen.
Director of cricket Kepler Wessels said: "We are a lot more hopeful than when it first happened. We will have another look at it when we get to the ground and see how he is."
If Sales fails a fitness test his place will be taken by Irish international Andrew White, who made an impressive Twenty20 debut in the tie with Somerset at Wantage Road.
Wessels was pleased with the introduction of Rob White in the second of back-to-back wins over Worcestershire Royals that has revitalised the Steelbacks' Twenty20 Cup campaign as they sit second in the Midlands/ West/Wales table behind Glamorgan Dragons.
"I wanted more impetus in the early part of the innings," said Wessels. "Rob played well and gave us that."