Southend United are likely to be without new striker Liam Dickinson for the start of the League Two campaign.
Dickinson, 25, who signed a one-year deal earlier this week, has been hampered by an ankle injury.
"It will be cleared up in a couple of days but he hasn't had much of a pre-season," boss Paul Sturrock told the club website.
"It would be silly to make him play against Hereford because we don't want him to keep on picking up injuries."
The news leaves the Shrimpers light in attack, with Blair Sturrock and Barry Corr also on the sidelines.
With frontman Sturrock nursing his own ankle injury and Corr currently out with a knee problem, the Southend boss played Bilel Mohsni in attack during Thursday's 0-0 friendly draw against Norwich.
The 23-year-old Tunisian, traditionally a centre-half, was used as an emergency striker last season, which helped raise his goal tally to five for the campaign.