Graham Turner has been telling BBC Hereford and Worcester about players contracts.
"They don't need to inform us until 19 June whether they are going to accept the offer, so in the meantime, you're not quite sure whether Travis, or Williams, Purdie, Beckwith or Connell are going to re-sign or go elsewhere.
"You have to have contingency plans to replace them, as well as the ones that we need to get in to strengthen the squad.
"We're looking at other players and, if they want to continue delaying things after 19 June, then we've got every right to withdraw the offer and sign somebody else.
"So it can work both ways, but obviously with regard to the players we have made offers to; we've done that because we want to keep them at the club."