Worcester boss Richard Hill has admitted that defence coach Phil Larder will have work to do this week after their LV=Cup defeat.
Worcester conceded six tries away at London Irish in a 46-24 defeat, a result that has ruled them out of qualifying for the knockout stages of the tournament.
Larder will return to the club this week after three weeks away and Hill admits that the side will be working hard on their defence ahead of facing Saracens next weekend.
"I'm disappointed and the main area was the defence," said Hill to Worcester News.
"I was pleased with our scrum and our line-out, pleased our penalty count was less than London Irish and some of our attacking play was encouraging.
"To score three tries away from home is a good feat. So many areas were very good yet we just leaked tries too easily.
"We have had two weeks in the Challenge Cup against Rovigo and Gernika when we haven't had to do any defending. We also have deliberately concentrated on our attack and not done any defence work for a few weeks.
"But next week Phil Larder comes back in after three weeks away and this is a fitting game for him to analyse and get us back on the straight and narrow.
"I am looking at that display thinking the set piece is good, the discipline is better and we scored three tries away from home. If we can bolt on our defence, which is normally strong, then next week should be different.
"We had a few different players in the pack and we probably lacked a little bit of ball carrying.
"When we have some of our front liners back in the pack it will be different, you could see the energy when we made changes in the second-half."