Jack Wilshere admits West Ham need to find their feet quickly under new manager Manuel Pellegrini.
The Hammers have begun the season with back-to-back defeats after Bournemouth came from behind to win 2-1 at the London Stadium on Saturday.
Pellegrini has brought in nine new players and he handed home debuts to four of them against the Cherries before summoning another three from the bench.
“We have got a lot of new players and we need to gel,” Wilshere told the club website.
“At this level in this league, people aren’t given time, so we have to do it quick and all tuck in this week.
“We started well and we all wanted to win this week and we felt we were good enough to win. Obviously, the dressing room was devastated because we should have come away with something from the game, but we have to go again.
“That’s the thing about this league, that you haven’t got much time to be down. You have to be back on the training pitch and go again.”
West Ham led at half-time through Marko Arnautovic’s penalty but Callum Wilson’s solo goal and Steve Cook’s header left them empty-handed.
Next up for the Hammers and Wilshere is a trip to his former club Arsenal, who are also yet to pick up a point under a new manager, Unai Emery.
“It won’t be easy next weekend,” added Wilshere. “We’ve had a tough start but you have to be willing to fight against anyone in this league and win your duels and earn your right to play, and I felt we did that at times.
“We played as a team, but we let in two sloppy goals.”
Wilson and strike partner Joshua King posed West Ham problems all afternoon.
“Callum did really well for us, his partnership with Joshua King is developing in a way we wanted it to last season,” said Bournemouth manager Eddie Howe.
“Joshua was strong as well but they both set the platform for our performance.
“I was really pleased with the team, we managed the game very well and it was a great win. We’d never won there before so it’s a good moment for the club.”