Avram Grant is confident captain Matthew Upson will stay at West Ham this season.
Upson is out of contract next summer and the Hammers are mindful that the England defender could leave on a free transfer.
Co-chairman David Gold admitted on Friday that they would probably have to accept any bid over £6million, which would give Grant's transfer kitty a much-needed boost before the transfer window closes.
But the Hammers have already staved off interest from Tottenham in Scott Parker this summer and Grant believes he and Upson are crucial to the club's plans for the future.
"Ninety per cent of the squad will stay and Matthew Upson is in that 90% who will stay here," he said. "We like him, he's good for us and a good captain, and he will stay.
"Scott Parker will play tomorrow (against Bolton) and will be at West Ham in the years to come. We came here to make the new season and the next seasons better than before.
"I hope we will be busy (before the transfer window closes) because we want the squad to be stronger.
"To do this we need players because we don't have a few players for some positions. We will try to do it.
"The resources of the club and the financial situation are not so good, so we have to think about that also.
"The challenge at West Ham is exciting and it is the reason I came here. We want to take the club forward."
Grant will take charge of his first home game on Saturday, aiming to bounce back from the 3-0 opening-day defeat at Aston Villa.
The new boss is also hoping to halt a run that has seen Bolton win each of their last six meetings with the Hammers.
"We didn't win at Aston Villa and we didn't play well but that belongs in the past," he added. "The record against Bolton belongs in the past too.
"They are a very good team. They play good football and don't play like they did before.
"They are trying to be different and they are doing very well. They were very impressive last year. But, of course, we want to win."