Despite the 4-0 defeat to Oxford midweek, West Ham produced their best display of the season last weekend, with a 2-0 win over Man Utd and are currently fifth in the Premier League.
Pellegrini has taken responsibility for his team’s performance against Oxford responded to questions about the defence by pointing to the improvement in statistics since his arrival.
Pellegrini said: “Well of course when I arrived here to West Ham I saw how many goals they conceded in the previous season.
“Last season we reduced that by 10, 11 goals. That is also too much so we continue working to try and reduce that more.
“For the moment until the last game we are doing well. It is a matter of concentration.
“This is football. You never know what will happen. Not always the big team that wins the game.
“Can’t take anything away from Oxford, they played well also. We couldn’t score goals and found a team that played well.
“I hope it was an accident and we must return to understand to play against every team with 100% concentration and intensity.”
“Against Manchester United we played a very good game. We had good concentration. If we can repeat that performance, we’ll win a lot of games.”
Pellegrini said West Ham must be wary of Bournemouth’s attacking threat on Saturday, but will be going all out for the win.
He said: “They play offensive football, with two strikers and another attacker on the left.
“We must be very concentrated on defending but we are going for three points. We’ll attack from the first minute and look for three points more.”
On in form striker Callum Wilson’s record against The Hammers he said: “Not just against West Ham, he is a very good player. Always strong, making good movements.
“They also have the other Wilson in midfield, they have King and other players who can score. They have dangerous strikers.”