Nottinghamshire batsman Alex Hales is expected to be out for a month after suffering a broken jaw in the County Championship game against Yorkshire.
Hales retired hurt on Friday after being struck on the helmet grill trying to pull an Ajmal Shahzad bouncer.
An x-ray on Saturday has shown he will have to undergo surgery.
Notts director of cricket Mick Newell told BBC Radio Nottingham: "It was a nasty blow to Alex's jaw and he will be out for a while."
Hales actually returned to complete his innings on Friday making 59.
"Alex will have the operation today (Saturday). We want him back as soon as possible," Newell told the county's club website.
"He has been in good form and we're disappointed that he will miss two important Championship matches."
Notts already have injury concerns over Charlie Shreck (knee) and Andre Adams (triceps).
Added to which, Andy Carter (abdominal strain) faces another month out, while Darren Pattinson (hamstring) is likely to be out for three weeks.
But Notts have confirmed that they will have England pair Graeme Swann and Stuart Broad available to face Sussex next Tuesday at Hove.