The Croatian was speaking after the Hammer's Europa League loss in Slovenia.
West Ham manager Slaven Bilic and assistant manager Nikola Jurcevic
Speaking after the Hammers' 2-1 Europa League defeat away to Slovenian outfit Domzale in Ljubljana, Jurcevic was discussing the absences of two players that were key men for the Londoners last season, with Aaron Cresswell and Manuel Lanzini set for a spell on the sidelines.
West Ham's Aaron Cresswell in action with Swansea City's Leroy Fer
"Maybe we will possibly do something in the transfer market because we need players in some positions," he is quoted as saying on Sky Sports. "Because Aaron Cresswell and Manuel Lanzini are injured and cannot play for a long time."
Left-back Cresswell, one of the club's outstanding performers last season, has been ruled out for a period that could reach several months, leading to lots of speculation about targets the club are considering to fill in for him.
West Ham's Manuel Lanzini celebrates scoring
Argentine playmaker Lanzini's injury is less clear, with it expected that he would feature in the Olympics later in the summer. Jurcevic admitted that he was set to return from the other side of the Atlantic but that little was known about the 23-year-old's condition, with reports earlier in the week from the Mail suggesting he had a knee injury but could still make the Premier League opener.
"With Lanzini, we don't have exact information," he said. "He will come back from America, where he wanted to play in the Olympic Games for Argentina.
"We don't know, but we think he will not be fit for the next game against Domzale."
Hammers co-owners David Gold and David Sullivan will now have to decide on adjusting their transfer policy, with a striker addition long the chief piece of business the club have been looking to do over the summer.
West Ham co chairmans David Sullivan and David Gold before the match