West Bromwich Albion boss Alan Irvine felt they paid for their errors in defeat at home to Everton.
He gave debuts to substitutes Sebastian Blanco and Georgios Samaras but the Baggies were jeered off after their third blank in a row.
And Irvine knows, despite being a work in progress, they need results.
He said: "It needs to be as quick as possible, we are not in that pre-season period we would like to have been in when we were trying to build the team. We're in the season and it's important to get good results.
"What I would say is that the players are working extremely hard to get there. We are seeing some good things but some mistakes are very costly for us.
"Jonas and Ben are experienced Premier League players and don't usually make those mistakes.
"These lads are generally very consistent and they are devastated about the goals. Mistakes happen and we have to accept that and move on."
